cannot do anything about. i had made it 30-something years with no tremor, so it didn't make sense it would come out of nowhere. >> as his tremor worsened, carter spent years being misdiagnosed, lyme disease, park sons. it affected his ability to act. >> how am i going to be on sets and hide this. >> and play music. carter refused to give up, especially with so much on the line. deep brain stimulation was his best chance. an electrical current courses through his brain. it's hard to see watching him there. carter was frightened. >> as scary as that is, i'm going oh to take that chance, rather than keep living my life in misery, in a secret hell. people say brad carter, actor, comedian, you know, the funny guy, fun to be around. but when i get home, i'm dealing with this thing that is eating me up inside. >> and get this.