SubQ;s are very helpful for kidney disease, but can be bad for heart disease, which makes it a difficult situation
Have they made sure that there is no tick disease, like lyme disease?
Diet is huge, and I would recommend a home prepared diet. Because of the kidney disease, I would use one put together by a nutritionist, like Sabine Contreras (that is who I use).
I am sorry that you are facing this, it is so difficult