My daughter (21) started having episodes of facial spams progressing to arm and leg jerking, eye twitching etc.... We have done all the medical stuff probably everyone here knows about, all the tests, scans, MRI, Cat Scans, blood work, etc and nothing has come back showing anything "medically wrong". She is also affected with Ocular Toxoplasmosis, which has reduced her vision somewhat.
The doctors here basically think it is neurological, and thinks it is caused ...