No, jcur, as far as I know there aren't any doctors responding to the posts. There are some "Ask a Doctor/Expert" forums, but when I tried posting a question it said that it costs 16$!! Bull. 16$ isn't worth a halfbaked answer from someone who hasn't examined you, and says not to listen to his advice anyways. Plus I don't want to give them a credit card number.
On the upside, there are some people with decent knowledge who answer posts - "tlh" has some educated answers and often recommends sites. Sometimes I've read posts from nurses, which are the next best thing.
are there doctors replying to the posts?
I have some news for you:
Apparently blood in semen is called "Hermatospermia." The most common cause is inflammation of the seminal vescicles or, as you rightly suspected, the prostate gland. So there we have it. Go see your Doctor, sir.
You probably know more about this than I do, judging from your visits to the doctor n that, but my guess is that this is not normal and you should see your doctor about it soon. Also, try not to get stressed so much, stay happy (easy to say, I know), and maybe go for a little walk every now and then at work, or sit on a cushion? Sorry I can't be more help, but without trying to alarm you, I think that this is Not Normal. I've heard about "blood in the semen" somewhere on the net, but I can't remember where. I'll go check it out, and if I find anything I'll post it, if only to "respect my elders."