Suggest Treatment For Pain In Lower Abdominal And Groin Area

I was training in mid August for a 1/2 marathon in early Sept. I had been training all summer and had previously run 2 marathons and four 1/2 marathons. One day, I could only run 3 miles due to lower abdominal pain. I thought I had a strained hip flexor from weight room work and received physical therapy for it. It had been tight. I did manage to survive the 1/2 marathon but it was painful- both the hip flexor and the lower ab pain. I waited a week and tried jogging 3-4 miles and still the lower ab pain- mostly on the left side. 3 weeks later I was in the hospital with a 3mm. kidney stone on the left side. They said I also had 3 small ones on the right side. This was after a CT Scan. After 36 hours the pain went away and I was dismissed. I waited 2 weeks and tried running. I finished 3 miles, but again lower ab pain (just above or beside groin) on the left and middle. I had testicular cancer 11 years ago (left testicle removed plus 6 weeks of radiation). I am 60 years old, am 5' 11" tall, weigh 165 and run 4-5 miles daily or did until the past 2 months. Blood tests 3 days after getting out of the hospital were normal and the urine showed just 1-2 red cells. I was in the hospital 1:30 A.M. on a Sat. morning until noon on Sunday. I went back to work on the following Monday and feel fine, except for running. I do not know if there is still a stone that hasn't passed causing the lower left ab pain when running or some inflammation?? I have taken some antiinflammatory meds but that doesn't seem to help much. I can run through it for 3-4 miles so it's not extreme. I'd like to get back to my regular training, but it's been 2 months with the lower ab just above the grouin pain in the middle and on the left. I see my regular doctor again in 3 weeks and the urologist in Dec. for my yearly checkup from the testicular cancer. Your thoughts.???