depression
"I started using Celexa in 2005 following the death of my best friend and other things that I could no longer cope with. I had suffered from depression on and off since I was a teenager. 
Some of the side effects I initially experienced was fatigue and dry mouth - that went away...then the excessive sweating started. After a while, I tried to go off it because I thought "well I'm feeling normal, and I'm tired of constant sweating". I started the slow weaning off process and bugger all, I felt myself getting more and more withdrawn and the excessive moodiness and depressed thoughts were coming back. Went back on it. 
It's helped me immensely, but like any pharmaceutical - doesn't have the same effects on everybody. It's working for me!"