I'm sorry you are having so many issues and know it is really upsetting for you. As far as he hospitalization goes I would advise you to ask your doctor what his plan of action is. Every one of us with these issues would probably have a different scenario when it would come to medication and any other treatments ordered. I would imagine you would have treatment only specific for you.
As far as your cat goes you might try calling a vet clinic and ask them for advice on what you should do for your cat. I would try to line up some type of care for your cat cause that way you can get your needed care. You might check with social services in your county also call a church or two to see if they have someone who would take a cat into their home.
These issues are difficult for your but I would wonder if you could get help from others and maybe take your cat to visit other possible caregivers in their home prior to placing her,
I also wonder if a vet clinic would be willing to give free care while you are in the hospital. Also, these clinics may know someone who takes in cats when their are difficult health issues. Don't give up and don't put yourself last on the list. You doc may want a kidney specialist to see you and do testing. It sounds like you need this done now to get your treatment specialized for you. Please know wthat I am thinking of you. PLease let us know how things are going for you. Irish