Hey There!
I gotta agree with Street on this one. BAD Heart trouble runs rampant in my family. I witnessed my fathers first heart attack at the age of 11. I also learned CPR at 15 and have kept myself certified every year. It came in handy during my father-in-laws second attack.
But the SCARIEST attack was my mothers. She felt strange pains in her upper chest and thought it was just stomach trouble beacuse there was no left arm pain or jaw pain. She let it go for 4 days before us kids (all grown now) convinced her to see someone just to be safe. She made an appointment with the cardiologist my father had used. Within 10min of being in his office he was shipping her out in an ambulance.
That was when I got my education on the difference between male and female warning signs. Some women experience the classic ones but others range from high stomach ache that won't quit to upper back pain to constant unexlained fatigue. The worst part is women are more likely to die from their first heart attack BECAUSE their symptoms at atypical.
I am definately not trying to scare you!! There could be other causes for what you are describing. I got a similar terrible pain like you described that woke me from a sound sleep. I couldn't catch my breath because the pain was so sharp. I actually considered I might be having an attack and called the life squad. ( I had been having trouble with a pain like you describe for a few days only not as intense) At the hospital, which is well known for its heart department, I was wrung through the wringer of tests only to find that I had severe constipation!! I had been having bowell movements only it appears that I was not able to clear my bowells completely and so it accumulated in a blockage.(YUCK!!!)
Boy was I embarrassed!!

But the doctors assured me I had done the right thing in seeking help and having my heart checked first. They told me that they would rather see 100 women who get tested and cleared of a heart attack than see 1 come in too late for them to save.
Get yourself checked just to be safe.
Lets us know how it turn out.

The Bard of Ohio