@staab4 Hello-in 40 years of being prescribed opiates post surgery-morphine never caused hallucinations.
In fact, from experience, I am guessing your surgeon could very well have included ketamine which is a dissociative anaesthetic and (in my case) while I was in the ICU, caused giant transparent visions of Nazi troops led by an enormous Shoe which tapped its way down the street. This was amusing. However, no morphine was used in my ICU care.
Like other readers here, I prefer oxycodone (which is Percocet without Tylenol.) No hallucinations whatsoever. A time release 12-hour version is called Xtampza. I find this one also has zero side effects.
Good Luck! I would ask your dr if he used ketamine on you.