Hopefully the other thyroid test will show something. Mt RB Storm had hyperthyroidism and his blood work and T4 test were also normal. Although I think his T4 results were on the high normal side. My vet did the other test that you mentioned which did take a few days for results and it did show that he had hyperthyroidism. I think we caught his very early. He had lost weight and he was drinking more than usual. He was always hungry but he was also on pred so this also makes him hungry. He was on the pred because he would vomit everything up and he was diagnosed with small interstinal disease which I guess is a form of IBD. I hope you can find out what's causing this. Lots of prayers and positive thoughts are on the way.