Uh its bad to hear about this condition :(
Just rest, its really important for now, i don't know too much about kidney problem, and i know its not directly for kidney but i can recommend you this:
https://www.lifeaidbevco.com/blog/2019/03/15/8-incredible-health-benefits-of-gin...
its about a natural "herb" named ginger maybe you hear about it but i can recommend you to try it out, i using it many times and its really have a good effect i buy a root "type" and i making tea fro mits and its really good and tastes well :)
its in eglish so its better to read
(i almsot sent you in hungarian because im hungarian XD)
i hope i help a little bit :)