I remember year before last I went to the emergency I was having sharp electrical jolts on my left side of rib cage they couldn't find what was wrong either a part of the testing was COVID came back positive a didn't believe them at first until I looked it up after I got home and it said it was a symptom of COVID anyway it went away after about 3 weeks. COVID effects the lining in between the lungs and the rib. Don't know how long you have been dealing with it but mine lasted about 3 weeks. Good luck.