Just thought I would let you know that you are not alone as I too have Costo. I also have an extra cervical rib and diagnosed with Bornholms Disease a while back so a lot going on in that area. I have twice been to the A & E with severe chest pains and treated with suspected heart attack so know only too well how bad and scary this thing can be. I read that Costo is related to Fibromyalgia which I've had for years.