I have had CFS for 5 years now. My main symptoms are the fatigue and flu feelings--like I have mono all the time. Never really had any pain until the last 6 months. Now my chest and middle back hurt constantly! I have had a chest X-ray and the stress test for my heart; they say everything is fine. But I am in pain!! Could this be costocondroitis? Has anyone on here had this? And does it hurt all the way through to your back?