You have so much going on right now! My prayers are with you and with all of your cats, especially sweet Puddy right now. After reading through this thread I think your idea to start her on the Epogen is a good idea. Perhaps it will make a difference or maybe it won't but then you will be able to decide knowing that you gave it a try. If it does seem to begin to help her maybe you could eventually switch over to your local vet for convenience for both you and Puddy.
I was also wondering if her being so withdrawn and maybe uncomfortable could also be due to the UTI or to the Zeniquin she is on to fight the UTI. I don't know anything about this drug but maybe with everything combined (kidney issue, anemia, UTI and possible side effects from the Zeniquin) she might be feeling awful. I am wondering if the UTI clears up or the meds are finished she might come around a bit and be a bit more ready to combat the anemia issue. How many more days will she be on the Zeniquin?
She is so beautiful and I know that it is so hard living in this limbo trying to figure out what is the best decision to make. Whatever you decide, it will be based on love. You have her best interest at heart and she is blessed to have you.
I'm sorry that you are going through all this and I hope that things will begin to get better on all fronts, especially with you and your health! Praying that the diabetes and thyroid tests will show that you don't have an issue with either. But I do hope that you will be able to get to the bottom of what is going on with your health and the recent changes. Please keep us posted.
P.S. I was so relieved to hear that you do not have ovarian cancer. The stress of wondering if you had it or not must have been tremendous. I'm glad that part is over and hope that a solution to whatever is going on is around the corner. {{{{{HUGS}}}}}