Thankyou everyone!! you guys are so great. The vet said Sumo probably ate something toxic or something he was allergic too, and that the food switch probably didnt help either. After the vet said that I remembered that I had chopped some onions for dinner and am assuming that maybe a couple pieces fell on the floor and he got to them? I keep a very close eye on him and i dont remember any pieces falling on the floor but that is the only thing I can think of that would have upset him this much

Thankyou again everyone!! Sumo and I love YT!!