Lung Pain-

So I'm almost at 4 weeks,smoking cessation, and for the past 2 days I've had my regular upper chest pain (which is apparently nothing as I've gotten an EKG in the time I've had it...it was attributed to my anxiety issues). But I've gotten a few very brief, very sharp pains on the side of my rib cage under my left arm which I'm told may be lung pain. I didn't have this pain while I was smoking. OK, pretty embarassing, but I get gas right after that LOL. I have a doc's appointment next month,stop smoking, but I'm just wondering if anyone else had any lung pain after quitting? Is this anywhere near normal? I feel fine otherwise.