I think my 15 yr old, otherwise healthy cat has feline diabetes. Anyone recommend anything, she is traumatized by the car ride and vet. She drinks water constantly has the unstable gait, irritable at night and can't sleep. Urinates way more then she used to. I stopped all dry food, now giving hi protein can food. I want to try benedryl at night so she/we can get some sleep.....anyone have the same issues with thier kitty?