anxiety and stress
"Was prescribed Zoloft and took sertraline for 6 months after I was having trouble with anxiety/panic attacks from a pretty nasty accident. It worked well after a couple of weeks but eventually I felt that I didn't need it anymore.  This is my 4th week of weaning off, and the withdrawal is almost unbearable. Dizziness, nausea, exhaustion, seeing weird flashes. I really needed something at the time, so I don't entirely regret taking it, but the withdrawal is bad."