Rosie, can any of the vets who you guys have seen do any x-rays? Rama is an old man now - it is hard to believe, I still remember the day he turned up in our pages, but he is. For all intents and purposes, the care and protection you have provided has left him where he is now about FOUR TIMES the average lifespan of a wild squirrel. And sadly, from what I have seen in the years on here, their little bodies aren't built to last that long, any more than ours are built to bring us to 300 years old. Bad things start to happen that are beyond the ability of medicines to deal with. The lump you have seen could easily be a malignancy and the symptoms he is having the result of that. An x-ray night be able to give you that answer instead of making assumptions about needed diet change which may have nothing to do with what is happening. Are any sort of diagnostics a possibility?