Many people who are dealing with chronic conditions - like FeLV and kidney disease (CRF) - find they can receive amazing practical help and information from others who have more experience doing the same thing. These people come together in online groups where all this information is shared.
For many reasons, these people soon discover that their combined knowledge and experience often outweighs that of their individual Veterinarians.
I would suggest that, at least, you check them out.
Here is one for FeLV
There are two focussing on CRF that I would recommend, here
. (I'd also suggest that, if you decide to join, you use separate email accounts for any such group.)