It might be the medication Steady. My Mom and Dad had me on medication when I was young and it made me a zombie, emotionless pretty much. from where he’s fairly new figuring out he has illness it may take cocktails of drugs for him to be on to figure out what drugs work for him the best.
What works well for others , doesn’t work well with some. I’ve been on cocktails of drugs ever since 15 or 16 and finally just figured out all I need is the Invega shot, that’s it. Although maybe something for anxiety and panic attacks would help, but other than that just stick by him and find the cocktail of medicine that works for him.
Have you considered since no prior watch of having an illness did he happen to take maybe mushrooms or LSD or smoke really good Weed at all? Maybe not since they drug test before you go into hospital and you would know , but just making sure.
But like I said if you don’t think he’s getting better it’s the medicine. Some Medicine will make you emoitonless and numb, but may not work so the doctors will have to switch him to something different. And bring that up next time you talk to doctor also, that you see no improvement so you want his meds switched now