What Causes Pain In Abdomen Along With Belching On Intake Of Food?

I am having trouble with my stomach feel raw or sore. I do belch a lot and have been taking medicine for gerds. I also have some problems with my bowels. sometimes they are moving right and other times they are like little balls. I had a colonoscopy about 2 years ago. they thing that I am really troubled about is my stomach. Some times I feel fine and eat and then my stomach will hurt or I will get cold after eating. should I see a gastrologist?