Bob, I'm with you on the hallucinations. Last March I had pneumonia, and saw some of the neatest wrought iron filigree work over my glass slider. But, then the fever lapsed and the artwork went away.
Years ago, I endoed (end over end over end) a motorcycle onto frozen ground. and ripped loose some ribs. When I finally got home, I crawled into a tub of hot water to loosen me up and comfort me some. I passed out. NEVER in my Lifer - before or since - had I done that.
Pain & sickness affects how our minds work, and the nonsensical seems OK. Weird. sometimes, I even begin to think that I make sense. But then, the curtains close again.