I have been having pain in the lower part of stomach/groin area and also on the left side. I have had some pain in my upper left thigh that comes and goes and a portion of my upper left thigh has a numb feeling. The pain is greater when sitting. This has been going on for a few weeks. I had pulled a muscle in my back in December and thought maybe this was due to side effects of the muscle relaxer and anti inflammatory meds I was on. I haven't been on anything for two weeks now.