Before rushing to an attorney, maybe seek another doctor's opinion about everything. They might be able to help you figure out another point of action. He will most definitely have to go for disability
through your state and then probably some kind of assistance if possible. You unfortunately can't take legal action all the time mainly because it's not their fault that he is ill and they probably need to monitor things to make sure that the next steps they have planned will be proper for him and his condition. But definitely seek another opinion from a doctor before running to the lawyer. It might save you some money.