Hi Jenn!
How's he doing today? I saw your ss comment yesterday that he seems to be pretty well back to normal - today too? Cats don't usually go from 2u off of insulin in one jump, although it's not impossible. I'd keep testing him to see if he's trending up now that he's eating normally again. You want to see most BGs under 100 and hopefully all tests under 120.
Fingers crossed for you both!