We have a 17 year old tabby cat. about 6 months ago we took her to the vets because she had a really bad cough. mind you this was the first time she had ever went to a vets. she is a very healthy, spoiled kitty! they gave her a pretizone shot and she almost lost her life! she had a serious reaction to it. after we made it through that, she started acting different. she drinks water by the gallons every day now, and wants to eat all the time, she has lost weight, she rubs against anything and anyone who will let her. her litter box has to be changed every other day, because it is so saturated. we need help. we are afraid to take her back to the vets, because of what happened. can anyone give us a suggestion.