It has been a week & I'm starting to have pain on my stomach if I eat or if I don't. But the pain is there everyday?

I had a gastric sleeve operation on may 18,2015 .. it has passed 1 year and 3 months. Everything was great. The pain feels like somebody has punched me in my stomach and its the same pain all day and I know it has nothing to do with constipation, cause I go normaly everydayBut the pain is there everyday. I'm thinking if it's gas, but I'm not sure.

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