Dissection of the aorta is rare, and hard to diagnose. Measha is probably right that her family doc saved her life, but that doesn't follow that the ER doc who saw her first was a bad doctor.
This is what John Ritter died of. It can mimic the symptoms of anything from a heart attack to a torn muscle in the chest wall. Just be glad you're alive already.
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*I am not a doctor, and any opinions I express on this forum are my opinions only, and should not be confused with real medical advice given by a licensed professional. If you are concerned about your medical condition, always see a doctor!