I have a little brother who is having these symptoms and I m not sure what could be causing them. He has gait problems, excessive saliva, speech impairment, disorientation, constant shakiness/unsteadyiness, poor appetite, poor vision/ double vision/ hallucinations. He does have a hx of tbi and he just recently stopped taking all of his medications for his adhd, mood disorders, and anger. What could he be possibly reacting to or what could cause all of these symptoms at once