Last night I had extreme pain radiating from (I think) my diaphragm. it started out a very sharp, burning pain then seemed to spread sideways and eventually felt like extreme pressure. The pain was almost unbearable - I felt nauseous briefly, but really just in horrible pain for a couple of hours. This is the 4th time it s happened....I ve called 911 twice, but heart checks out fine....I cannot imagine it could be heartburn as the pain was worse than childbirth! I am a 46 year old female, about 150lbs, 5 4 .