I would get him to the vet sooner than later.... and then you may want to re-evaluate what your feeding him because Im sure it doesnt help his digestive upset....
Heres the ingredient list off your bag right?
ground yellow corn, corn gluten meal, chicken by-product meal, soybean meal, beef tallow (preserved with mixed tocopherols), animal digest, calcium carbonate, turkey by-product meal,
salmon meal, ocean fish meal, phosphoric acid, choline chloride, salt, potassium chloride, titanium dioxide (color), vitamins (vitamin E supplement, niacin supplement, vitamin A supplement, d-calcium pantothenate, thiamine mononitrate [source of vitamin B1], riboflavin supplement [source of vitamin B2], pyridoxine hydrochloride [source of vitamin B6], menadione sodium bisulfite complex [source of vitamin K activity], vitamin D3 supplement, folic acid, biotin, vitamin B12 supplement), minerals (ferrous sulfate [source of iron], zinc oxide, manganous oxide, copper sulfate, calcium iodate, sodium selenite), taurine, yellow 6, yellow 5, red 40, blue 2
, rosemary extract.
Everything in BOLD is bad in that food. Anything that has by products is a mystery meat. Meaning it could be anything from chicken feet to random road kill. Not good. Corn is also not digestible for a cat. They are a carnivore right? Meaning they eat meat. Natural meat.... Not byproducts. A lot of people on here Im sure have good suggestions for you including me. Just going over the health and nutrition section you will find a lot. Feeding him this food could be contributing to is upset tummy. Theres much better things you can buy with your money