The only thing I could possibly add is from two key things you said: auto-immune psoriasis and that you're feeling really tired. There is something called auto-immune hepatitis. I don't know much about it, but maybe something to google?
Dear Dancer,
I sympathize with you. I took a medication one time that goofed up my digestion for good, they call it the usual IBS, bouts of constipation a few times a year, no appetite. Anyhow, I've had a lot of medical problems over the years from a car wreck, I'm older now and on disability, and I now think I'm fairly stable, all things considered. But the point is, I have learned a lot about health, and I was also a nursing student ages ago and worked in old people's homes.
What I was looking for in your report, and found it, was the "narrowing" parts of your bowel. Part of what happens to you is, the digestion can't get thru those places as fast as it should, so the waste gets stuck. The more that you eat, the fuller your intestines get, until you get nauseated and sometimes throw up. The solution is to have a top-knotch gastroenterologist surgeon operate on your bowels and get rid of those "narrowing" places in your bowels.
Go to a doc who is associated with the state university hospital in your state. I live in North Carolina, so Duke University and UNC-Chapel Hill are the hospitals I'd be looking at. In South Carolina, Charleston has got the best medical school hospital that's a branch of their state university branch there. Seems like I recall also, for example, in California a couple of the top ten hospitals in the country (according to U.S. News) are also university hospitals... I forget, but I think Stanford and UCLA are the ones.
I have a relative who had colon cancer and after the operation, a "stricture" developed, which is where the scar tissue tightened up parts of the bowel, and it had to be loosened up. This is a common result from bowel surgery. So, what you've got is very similar to that, in the way your intestines were at birth. So, that's how come I know what narrowing of the bowels can do to a person. It's serious enough that it normally should be operated on.
Now, your recent green in your stool indicates your bile is goofed up, which all that stuff is situated between the stomach and intestines, right under the liver, to include the gall bladder, bile ducts, and so forth. If your guts are holding too much waste or even backing up, well, then the bile ain't going to have nowhere to go, and it can cause all that green bilious stuff to malfunction. So, you ALSO have a gallbladder bile-duct situation now, which will probably eventually need looking into by a specialist.
In addition, as if all those things weren't enough, because the waste sits in your body too long, it can make your body toxic, and you can get infection in the body, and I'm thinking your thirst has to do with your kidneys and perhaps something to do with diabetes. Now, kidneys and diabetes, I don't know enough about to comment, except it's all part of the digestive process, which has been unhealthy your whole life, and may now actually be malfunctioning in that area, too.
So, in sum, you need those narrowing places in your bowels repaired, you then may need someone to find out what's going on with your bile and gallbladder, and someone to find out if you've got diabetes or something amiss with your kidneys. As for you idea of an autoimmune disorder contributing to all this, that could very well factor in, too. So, the docs need to keep that in mind while they do any of the investigations I'm suggesting.
There is a possibility that if they could just get your bowels opened up, that your other symptoms will subside, and you won't need to deal with bile and diabetes and all that other jazz. In other words, if you cure the original problem, the complications might end. And if not, why, you'll know those other things need to be looked at, could be there's a little damage as relates to those.
While you're waiting to get some surgery (and ask some docs and other people if you should do that, of course), I can tell you what I do when I have constipation, altho I don't imagine it will help you entirely. I noticed one of the docs said don't eat too much fiber. I imagine what he's thinking is, if your waste gets stuck, and then you go and pile bulky fiber stuff on top of it, you're not doing your guts any favors. So, I cannot say to eat oat cereal or whole wheat bread, but that's what I do.
What I can tell you, and you probably already know all this, is to drink lots of water, but DO NOT drink too much juice...juice has a drying effect, and yet you must drink 4 oz of orange juice daily, it's very good for the muscousal linings in your body. Also, you need to of course be active no matter how you feel, because exercise keeps "the engine oiled," which is to say by moving around physically, it will help your bowels move easier.
Even tho you shouldn't have fiber, I can see no harm in a small dark green salad daily, or some slices of cantelope (eat catelope by itself to prevent gas). They have high water content, not much bulk, but both will help your digestion move better because they have some bit of fiber in them. Spagetti is easy to digest and also has a lot of water content. Blueberries REALLY helped me when I first had IBS. And then there's Activia yogurt or Acidophilus milk, they have "good" bacteria that help break down digestion. Lastly, a half-cup of coffee can stimulate the bowels to move.
I have to assume that once the waste gets to where it's ready to come out, that it does indeed come on out, if the narrowings in your bowel are further up. But if it is dry and hard to pass when it exists, you can buy "Baby Lax" at the pharmacy, a little box of tubes of ointments, and squirt two in there and it'll come out for you. Keep the area lubricated with plain KY jelly after you bathe, too, to help passage of waste in general.
I hope this way too long reply helps you out a little bit. But I wanted to tell you everything that came to mind about you. Some of it may be somewhat incorrect information, and so I apologize ahead of time, just ignore what doesn't turn out to be helpful. But at least it will give you some ideas to work with, in your battle to be free of your ill-health for all these years. Oh, and I admire you for being a dancer.
GG