Facing stomach issues since one year.

I have been facing stomach problems since one year. I had mild pain Below the right rib, gone through so many tests and used medicines but there was no use. After few months I stopped using medicine and the pain has stopped. Recently I joined a gym for the first three months everything was ok. For the last one month, the pain has started in my left abdomin above the belly button. It feels like something is pulling inside and it gets worse while eating especially in the morning. The pain gets low/ goes away when I change my body position(sideways). And the pain in my right abdomin has also started again. The pain very mild. Please help me in knowing what the problem is and help sort this problem..