This all started last Friday when Jerry started wheezing so off to the Vet we go. After receiving a shot for his wheezing we come home and all went down hill from there. Noticed Jerry was not feeling so hot on Sunday. He has been eating, drinking and using is litter box. I thought maybe it was the shot he received for the wheezing so I had just been keeping an eye on him. Today after still not feeling good I loaded him back up into the dreaded cat box and took a trip to the Vet. Blood work was done and his sugar was over 300. Taking him back in the morning for more testing. Worried sick about my fuzzy buddy. Could the allergy shot for the wheezing have caused this to manifest? He is 7 years old and weights 16 pounds. The vet said he has lost half a pound since Friday.