depression
"I was on Zoloft for about 8 years for severe generalized anxiety disorder and major depressive disorder. I was eventually maxed out (200mg) and I felt awful. I couldn't feel emotions at all, it was almost like depression but less hopeless. I felt like a zombie. Or a robot. I also had pretty severe sexual side effects as well. Got taken off, and I feel like a real human again. I'm on Wellbutrin now."