*UGH*
Anything kidney related, I feel your pain. Its not a fun thing, so PLEASE go to the doctor. Its a "relatively" simple procedure if thats what you've got, better to get it done and over with.
Missing something education related sucks, and repeating a class that you've not even failed sucks even more. BUT its HEALTH FIRST!!
Otherwise I will sit here with my pointy stick...

Take care of yourself. *HUG*