Last night (Sunday) I was having problems getting Buddy to eat, after a while I got him to eat FF classic. This morning he took a few bites so I thought he would eat more later so I went ahead and gave Buddy His shot. I was wrong he did not eat and I had given 5.6u. I went to look for Buddy and walked by his litter box, he had a massive blow out in his litter box, nothing but liquid. I took a reading of Buddy's BG and it had shot way up.
I took him to the doctor and he said, this time of year cats get a G.I. bug. He put Buddy on an antibiotic, I hope this helps.