@mmmartin Have him watch his fluid intake so he doesn't overtax his kidneys. Also, watch his intake of salt, phosphorous, potassium, calcium, and protein. The goal is to not stress the kidneys as they try to do the job they are supposed to do.

If he is on medications, can you get a review by a pharmacist to see if there are any he should be wary of, that may be causing side effects either alone or in combination with others?
Ginger