Hello, I Am A 70 Year Old Female Who Had

Hello, I am a 70 year old female who had surgery in March to remove about 8" of my colon. I don't seem to be having a problem with that but my problem is continuous stomach pain, mostly lower center of stomach. I had a CT scan about a month with contrast and nothing showed up but still have pain. The pain is not debilitating but just annoying as it exists everyday. Any suggestions as to what it might be or what I should do?