I think we're reaching an understanding, and can reach it faster if we don't polarize as I for one am certainly guilty of doing here.

One side of the argument is NOT saying, "Because it's a medical issue, there is nothing behaviorally that the sufferer can do to help him/herself. Pills are the only answer." But the other side of the argument is reacting as if that were said. Similarly, the other side of the argument is NOT saying, "There is never a medical factor. Mental illness is always a spiritual and behavioral issue, nothing more." (Well, that other guy is saying that, but nobody here.) But the first side of the argument (me) is reacting as if that were said.

Edited to add, because it's been asked whether I have definitive proof of my brain being at fault.

I've never had my brain scanned to see if it really is deficient in some chemical. However if I don't take my medication, therapy is of no help to me, because my brain will be too dull to grasp the concepts therapy would present to me. I won't have good reflexes, because even in a crisis I would have to stop and consciously decide what to do next. Situations will take a while to "register" in my head. I will think slowly, causing me to move slowly, while most people around me are scratching their heads thinking, "What's taking you so long?" This has applied even where there is a fire ("Why are you just standing there? Move!") or a car door suddenly comes open on the highway. ("Well, close it!") I have been slapped and called stupid because on occasion I will have trouble understanding spoken instructions. I can repeat back what is said to me, but I cannot connect one word logically to the next, and make sense of the meaning. None of this has anything to do with intelligence, but it can look that way sometimes, which is why so many people have said to me, "If you're so smart, how come you can't figure out...?"

The fact that my medication helps me with this, I take as evidence that my physical brain is involved. Therefore it is upsetting to me to have someone suggest it's all something I could consciously control, if I could only figure out how.