Just found this thread. Did the Bug man spray in or around the outside of your house. I ask for bug spray can commonly be toxic to rodent, even so there is a new source that isn't, most are. Perhaps try adding Pycnogenol, it has been used in tree squirrels. It is a extract from the cambium layer of the maritime (pinaster) pine. It protects and supports the liver from toxins, and improves kidney function so that they last longer, save in end stage kidney failure.
I have a friend whose next door neighbor had their weeds sprayed with a commercal herbicide; soon after their female squirrel developed a confirmed lymphoma lesion under the skin on the flank. When it was discovered they took their squirrel in for their vet to examine, who removed the first lesion. The problem was that the the squirrel wasn't adequately supported with heat so it got cold. They were afraid to have the 2nd lesion removed when it appeeared following the healing of the first one because they thought they might lose their squirrel from the surgery. Not saying a squirrel can't be properly supported with heat during surgery as they should be of course.
They included Pycnogenol in support of their squirrel that lived 6 mo. past the removal of the lesion. PYC as it is known, is anti bacterial, anti viral, anti oxidant, and anti inflammatory as well as anti diabetic, and pro blood, and skin health. It improves the function of the organs, including the heart, kidneys, liver, etc. Two drops from a non-needle (1 cc) (1 ml) syringe included in food. Having an aged southern ssp. E. Gray squirrel, the diet for the squirrel was adjusted according to the need to raise calcium and lower phosphorus the main source being the protein in the diet. Rat research commonly references that as rats/rodents age they absorb less and less calcium, but also increasing retain more and more phosphorus with their kidneys concurrent to the same. For this reason, it was needful to lower protein the key source of phosphorus in the diet, and increase calcium at the same time in support of adjusting the Ca:P ratio of hte diet in order to not support an in body ratio that is too close, that hastens the development of kidney failure.
With a rodent block diet, this means lowering the portion of block by about a third, and then adding back Calcium in the form of calcium citrrate that ameliorates the function of the kidneys to bring the ratio of Ca:P up to around (2. 65:1) that takes the pressure off the kidneys and supported bond health. This confirmed by Dr. E of Florida both in an X ray and blood tests that were found to have normal values. PYC has also been found to lend protection to the liver from toxins.
https://vetspace.2ndchance.info/ever...-your-pet-rat/
I've spent the better part of the last ten years studying rat and squirrel research in regard to diet and aging in which I acrued a large library of PDF files. If there is anything I can do as far as sharing some specific studies on pertinent medical issues, you are welcome to send me a PM and I will do what I can to get them to you by email. Diggie's Friend.