Not quite sure what the Zoloft has to do with any of this, that's an antidepressant. Lots of people develop "tics" from time to time, behaviors that they're not aware of but others are. Usually these go away when you realize you're doing it and just stop doing it. If it's an involuntary movement, a true physical tic and not something you started doing that has become a habit that can be broken, you need to see a doctor to see if something is going on and if there is you might be referred to a neurologist. So again, "tics" can be habits we pick up and don't realize we're doing them until we find out and stop doing them, or they can be actual involuntary movements which need to be examined by a doctor.