I take a few Standard Process things for my stomach which seem to help.
-A-F betafood helps with gallbladder and kidneys
-Gastrex soothes inflammation
-Zypan helps with hc acid
-Enzycore is a digestive enzyme and also has L Glutamine in it which helps rebuild tissue.
If you think you ate something bad I would recommend Formula SF734 from Thorne.
I know there are lots of things to eat that will help too but I know with my stomach sometimes no matter what I put in it it just doesn't like it:/