I have been on and off zoloft for years, and every time I taper (every other day) besides the side affect I believe you were getting at, Zo also caused me to yawn all the time, be tired, be waaay too goofy and also it caused me to act out aggressively. I really noticed this the last time and I have quit it for good.
If you still have some, try to taper and talk to your doctor.
Lily