I used to get that where I felt faint from hunger and embarrassing gurgling stomach - I thought it was normal! I used to have to take Omeprazole all the time too and it was awful (and is not very healthy). Until I was diagnosed as a coeliac and went on a strict gluten free diet. I'm now following a keto/low carb diet (which is by definition mostly gluten free) and on days when I have more carbs than usual or when I get glutened by mistake I get the same symptoms - extreme hunger, gurgling stomach, the shakes & when glutened also pain & reflux) . Might be worth asking your gp re coeliac disease? If you suspect it may be that then please don't try go it alone, for a diagnosis you need to still be consuming gluten for the tests to be accurate.