Pain can be so corrosive, and in itself can cause depression. Depression can make pain worse. It is unlikely that the toxemia still is effecting you, but you should address that question to an expert in that field, which I think you can find on this site.
It is very likely, from what you have said, that a real depression is apparent. The proper treatment would be a combination of psychotherapy and antidepressant medication. Celexa is a good one, and you should probably stay on it.
If you can't find a psychotherapist because of where you live, you could start that process online by going to www.masteringstress.com.
If I were in your shoes, I would see another dr.
Are you taking hormones? I would also get checked out in this area...and do ~natural~ estrogen & ~NATURAL~ progestern. I know that hormonal imbalance can cause a lot of problems, including depression and weight gain. At 37, you might be experiening perimenopause and might be going through early menopause???
This site seems to have a lot of information. It might help.
http://www.project-aware.org/
Also, I would drive as far as I needed to drive to see a doctor. (yes...another doctor...) Don't mess around...MAKE YOURSELF FIND A GREAT DOCTOR!
I think it is important to find the root of your problems. A second or third voice might be helpful.
The meds for depression are probably good if they are not causing problems. ...and someone to walk you through this time is vital.
P.S. If I gained 60lbs., and was in pain, I would be depressed also. Hang in there...and let me know how you are doing.
It is hard.
I need some help too!