I am 39 years old, been smoking since I was 11. I have had chest pain for years. I had cardiac tests, but nothing. My xrays have been clear (although it has been a years since my last one). I had a VQ scan which showed low probability of a blood clot. Recently my shoulder, clavicle, chest and arm has been hurting and burning...I am really scared and I do not have insurance at this point. Please give me some advice.