What Can I Do About Frontal Lobe Damage And Psychosis After Stopping Olanzapine?

My son is 27. Has had a few TBIs that were never treated. He has significant frontal lobe damage. Was on olanzapine for the past 5 years. He stopped talking it and has been in psychosis for a couple of months. The withdrawal side effects of coming off of antipsychotics is inhumane!! He has been in the hospital for 2 weeks and is now taking risperdol and lithium. But he still sounds off. And is delusional about the facts. And now he gets angry more easily. He desperately needs neurobehavioral rehabilitation but there is nowhere in Colorado that has a program to help him. The medication is just a bandaid. They re supposed to release him on Friday. I feel so helpless and afraid for him. He lives with me and I feel so responsible for not getting him the proper care when he really needed it in 2017. What do I DO to help my son?