Have you done any research on Tourette's Syndrome? Causes involuntary movements, called tics. Teeth grinding common, as well as mouth and eye blinking, making noises, and repetitive behaviours. It is an anxiety disorder, connected to OCD...you can read about it or ask your dr. I see you have ritalin and anti-depressants, common meds in treating anxiety disorders.
My family has a history of this, my husband is 57 and has been taking ritalin since 50 years old, diagnosed with adult ADD...