I've been given ketamine a couple of times- it can be disconcerting but it is better than morphine. I don't recall much when on ketamine but I did have some mild hallucinations as it wore off. What bothered me the most was the agitation I had as i knew I was letting minor things bother me far beyond the norm but I couldn't help it. Knowing I was being short tempered with people over things I typically did not notice was a real issue for me. It actually increased my agitation for a while.

Best wishes for a speedy recovery and, as mentioned, follow your PT regime precisely. Don't push it either as that can be as bad as not doing it, especially at first.