I am a 37 year old female (5ft, 130 lbs, active....runner, yoga). I have endometriosis and was diagnosed with fibromyalgia 5 years ago. Last weekend I spent 4 hours painting a house. About two hours after I stopped I started feeling like I was being stung by a bee on my right side, upper ribcage, under armpit, between breast and back. There was no bee...there is no red spot...it looks normal. Could this be fibro related?