I wonder if it's a nerve problem. Maybe you have a damaged nerve, or maybe that lump is a cystor infection that is impinging on a nerve. I would go for the muscle/nerve specialist.
ihad the same pain,sharp,burning,like you said tightness around ribs, only on my left side, nothing showed up on xrays was kinda like a try this and try tha show nothing t. then my dr. said, if i didnt know better id say you had the shingles on the inside (without the typical rash) so we treated it for that and thats what bitb was. now 10 years later ive got the same painful sympomtoms which we though we from my recient fungl pneouma intensive care stay of 16 days, because it started right after i came home. xrays came back ok but PAIN HAS NOT GOTTON BETTER So dr app. tomorrow im gonna mention the shingles internally again. ill bet their back. have you talked to your dr about maybe you might have the same thing?