@karenann01 I just read your post. This may have nothing to do with your pain but I have some very small bruising in the same area with pain. It comes and goes with how I move. Like you, I wondered what was wrong back behind the pain. It started a year ago but now I have figured out the cause. When I had my mammogram done, the tech had a terrible time trying to get me positioned right. She pulled and pushed, then finally got someone else to assist. Both of them struggled to push me harder on the platform. The pain was terrible, it could not get done fast enough. So the platform that I was pushed into left my ribs sore and marks in a line right under my rib cage. The soreness in that area is becoming less but still there.
As I said this probably had nothing to do with your pain. I thought I would just throw this incident out. I hope you find the source of your pain. In the meantime stay healthy and send an update if you figure the cause out. KLH