Ahh, okay. Just a thought. Hopefully the explanation for the change turns out to be something benign rather than disease related. Positive thoughts.
@oneandahalfcats, he's only been on prednisolone for 1.5 weeks as a trial for his feline hyperesthesia syndrome (FHS) and possibly low-grade IBD. The vet wanted to try it for 2 weeks and see if it helped. It was not prescribed as an anti-nausea and appetite stimulant only, although since his eating has decreased in the last month, I was hoping the pred would increase his appetite.
That must be so frustrating for you. I hope they are able to figure out what is going on with him. It is so hard when you can't find the cause of their issues.