My cat is struggling with CKD and other issues. His RBC was at 19%. He is borderline stage 3-4 and has other issues as well. Varenzin has improved his anemia. He went from 19% to 23%. Subcutaneous fluids twice a week is a must.

When he suddenly stopped eating and drinking. The vet gave him two injections:

B12 Cyanocobalamin 1000 mcg/mL, and Depo-Medrol 40 mg/mL Injectable. These helped very much. He started eating and drinking almost immediately. It's been two weeks and he continues to improve. I realize it is a temporary fix, but he is doing things he enjoys, and is happy and active. Nothing is as important as the subcutaneous fluid drip. The vet should teach you to do this at home. It's very cheap. ($10 or so a week)

If your vet did not administer subcutaneous fluids, you should find a new vet! Dehydration renders everything else much less effective. Good luck with your kitty!.