How can i tell if i have stretched out my gastric bypass pouch, are there any symptoms

Stretched pouch: Depends how long you are after surgery. Your increased food intake could be normal if you are a long time out, let's say two years. But if you regained weight and are concerned and it has been several years out then you can follow up with your surgeon and get a work up like an UGI series oand endoscopy.

Try Bagel Test: After a bypass, you can test your pouch size and emptying by a bagel test. Eat mini bagels until full (in morning without any fluids). Record number of bagels (could be up to two for normal). Then wait 30 minutes. Dont drink anything. Try eating mini bagels again. Ideally, most of the pouch should still be full and you should only be able to eat one.