Cat with diabetes

My 12 year old male cat has diabetes.  He just spent 5 days at the vet while I was on a business trip.  During this stay we started him on insulin to try and help control the diabetes.  I brought him home from the vet this morning.  When I got home form work today he would not eat any food.  I administered some sugar solution and then the insulin dosage.  Now I notice that his pupils are different sizes.  Also he is urinating frequently outside the litter box and it is blood tinged.

Are these all symptoms of the diabetes?  The blood in urine and different size pupils are new symptoms.  

[opus88]

here is an excellent site with a wealth of info on caring for a diabetic cat...lots of reading.

http://www.medhelp.org/posts/Cats/Cat-with-diabetes/show/1905729

frequent urination is normal, but not blood tinged. nor are the unequal pupils. I would definitely take him back to his Vet or at least call them with an update to what is happening.
good luck and keep us updated please