If drs are throwing many meds into his mix, I'd study up online about each one- Drugs.com | Prescription Drug Information, Interactions & Side Effects or similar sites.
Just to know about interactions and possible side effects.
Sometimes drs do tend to reach for the rx pad vs really investing more time for best long term care..

I don't know but could some of the meds be part of this big scary change?
A good question for docs..

A meds /symptoms journal might be helpful, no need to be fancy just log down when any odd changes happen related to meds or activities..

He might be better off to stay home and avoid friends and activities, noise, drama for awhile.. PC, tv, phone screen limits too. calm & quiet..so his brain can recover.