What causes tingling in body and face?

Hello--my 18 year old daughter just called from college to say that she was awakened early in the morning with a sensation of whole body tingling--even on her face. It lasted for about 10 minutes. She takes 20mg of amitriptylene to help with Thoracic Outlet syndrome (has for years with no side effects like this) and began taking 40 mg of Prozac in the fall to help with OCD. She sleeps at least 8 hours a night but is extremely sleepy, actually having trouble staying awake in class. She has also had a number of incidents with spatial awareness, backing into or bumping fence poles or other vehicles with her car. Four incidents in the past month is not typical for her. Her hands have a tremor, we think from the meds. Not severe, but troubling as she is a pianist. She has had a couple of episodes of nausea in the past two weeks, as well. She had a sleep study four years ago that revealed no abnormalities. Her grandmother has Sjorgrens Syndrome--perhaps that is relevant. Not sure what our next step should be to get some answers for this sweet young lady.