canned pumpkin might help

How are her kidneys? Did the vet say? He should be able to tell from her bloodwork. I have a 17-year-old and she has the beginnings of chronic renal failure (CRF) and recently she had a tummy upset and got severely dehydrated and I could hear her stomach rumbling too. The vet told me to give her 1/4 pepcid a/c every other day or so. Just the pepcid a/c not any other formula and never anything like pepto (because it contains an aspirin like ingredient and aspirin is a big cat no-no!!).
You might ask your vet about the pepcid, and be sure to double check on her kidneys. Sometimes the weight loss and stomach problems are symptoms. Good luck!

there are several reasons behind flatuence (excessive gas)most of which can be traced to problems such as dietary.
How are the cats stools? How the stools are can help diagnos the problem. If parasites have been ruled out and the blood work came back within normal ranges you are probably dealing with either IBD or Pancreatic insufficiency in the early stages. Both can escape normal blood work and have specific tests to rule in. The pancreatic insufficiency requires an TLI test, and IBD requires a biopsy of the intestional track. Both however also require feeding a highly digestible fiber ( not high fiber but easily digested fibers) and a low fat amount.
California natural has a fish and sweet potato line which works quite well for this. What happens is a better food with these specific amounts helps give the digestive track time to be free of the other irritating to the digestive tract ingredients. These irritations cause problems in the digestive track in which bacteria build up which is why your vet prescribed some anti biotics and digestive enzymes. Problem is if you are still feeding the same foods and or treats you are still creating an unfriendly atmosphere.
You can try the food change to start off with a non invasive approach to this, and mention this all to your vet so that you are working together. Best of luck.