Let me add one more thing on the "drama queen" vs. "illness" debate:
The first year or two I was on meds, I used to rebel by quitting them periodically. I didn't like being numbed out, and when I started feeling better, I decided I didn't need them anymore. Every time I did this, my pdoc would very patiently say, "If you had bronchitis, you wouldn't think twice about taking medication to get rid of it. Depression is an illness too. So what's wrong with taking medication for it?"
Took awhile, but he finally got it through my thick Polack skull. :-)
Tell your brother it's a well-documented biological condition and hand him a DSM-IV or something.
Candy