Dad came out of the surgery and became very billegerent and confused. Advice?

My Dad had hip replacement surgery October 17, 2014. He had a set back after surgery with a bleeding ulcer. Finally released by hospital a week after a colonoscopy. He still did not do much PT and had multiple blood transfusions.
Now some three weeks into rehab I am told little and he still is a bit confused and belligerent. Psychiatrist was not much help and wants him in Haldol. They were trying to get him to take Zypraxa. I told fiction they need to crush it up for him.

What is stressful is he was fairly functional for bring 86 prior to surgery. He has some anger issues and memory loss but not to such a magnified level. I am unsure what to do next.