You didn’t say whether he’s at home dialyzing or in-center, but sounds like your Dad is having allergic reactions to either the dialyzer, and/or tubing…could even be the dialysate or even the heparin…other reports of shaking are blood pressure medications with Polysulfone dialyzers…
However, pinpointing the causes takes sometime step by step beginning with flushing the whole lines and dialyzer with 2 bags of saline…if that don’t help then the heparin needs to be looked into…
The best bet is to consult with your Dad’s Dr. about these allergic reactions…and if he’s taking blood pressure medications ask your Dr. about what I just said about Polysulfone dialyzers and blood pressure medications…