I developed this 7 weeks ago after a few weeks on minocycline . I have been in treatment for 2 years for Lyme babs and now Bart. I have had various symptoms for many many years. But this pulling and movement feeling under the left rib cage around to the back makes me wonder if it is the spleen. I feel it especially when I get up from a sitting position and it is not a muscle. Like something is moving inside of me under the muscle--not a tingling feeling but definately a rolling movement and yes a "pulling-tunging". Like some giant spirokete is rolling around inside (just kidding I think)!!!!LLMD wasn't concerned when I was there last, but I will tell him again next week as I think it is getting worse. It is definately NOT a digestive thing. Blessings