I Have A Dull Pain On The Right Side Of

I have a dull pain on the right side of my waist under my ribs and right by my naval. For the past two months, music urination has changed and I get up at least twice at night. Sometimes I feel like I have to go really bad but once I do, it's barely any there. The dull pain is more noticeable when I sit down. I don't know what to do?