See your doctor ASAP. I had the same thing about 3 weeks ago. My kidneys went down to 12% function. We had scheduled to get a port to start dialysis but fortunatly because of quick responses, dialysis has been spared as of now. This is very serious and NOTHING to mess around with. Also, I am sure you know but try and be mindful of salt usuage. I am guessing at stage 4, you are probably not on lisinopril right now. As in severe kindey damage, lisiniopril can wreack havoc on the kidneys. Lisinopril is more of a maintenance drug to help control the protein ONCE things are under control. but hopefully you are on some type of BP medicaiton?? Do you know which one?
PLEASE call your doc or go to the ER. I would much rather be over cautious than have to start dialysis!
Cyclosporine, Prednisone, Lisinopril,Norvasc, Mobic, Vitamin D 50,000 units
PRN: Imitrex, hydrocodone, Ambien, Flexeril, Ultram,
If God brings you to it, he will get you through it!!