Does thorozine cause damage to your central nervous system and if so is there anything to possibly reverse the damage done? My brother is very shaky.

It can. Thorazine (chlorpromazine) can cause sedation as well as movement problems -- some of which can become permanent. Doctors monitor patients on such medications and reduce doses to the smallest effective, to avoid such long-term results. Also certain medications can ameliorate some of these problems, at least acutely. Using alternative antipsychotics @ lowest possible effective dose may be even better solution.