Pouncing back in after a long absence. I see you have a few new cats since I last visited, pretty ones too.

Like others here, I've had several cats with hyperthyroidism and it is almost always easy to manage. Occasionally a cat will have a poor reaction to Methimazole, but that's rare. You can either pill or get it made up into a cream which you massage into their ears. Or, you can go the radioactive iodine treatment route, which I did with one cat and it worked out very well.

Most cats do eat constantly and still lose weight so I was flumoxed when one lost his appetite, but the vet said that could happen. Your vet will know this very well, that hyperthyroidism can mask the early stages of renal failure because the more rapid blood flow will cause an increased flushing of the kidneys. Once the hyperthyroidism is treated, the renal failure will show. Considering Storm's age, it is a possibility - BUT, also very highly treatable. When he has a second test to check the medication is working, it will show all levels.

Wishing you both well, with an easy treatment and lots of years of fun to come.