For a couple of days, I have been experiencing excruciating left sided chest, as well as back pain. Obviously, it's not a heart attack because I would have died already. But, I can't relieve it with aspirin, motrin, tylenol or advil. Sometimes it hurts to breath, but mostly hurts when I change positions. I have suspected "ankylosing spondylitis or Reiter's Disease," possibly an autoimmune condition in that category, but that usually affects the lower back, and this isn't that. I am otherwise, young, not overweight 21 year old caucasian male. I have a doctor's appointment in the middle of the week, but I need some answers now! If anyone knows what it could be or has suffered with this, please let me know! Thank you!!