Chest pain, pain shooting down left arm.

I've been having chest pains at rest for the past 6 weeks. The pains are either in the center on the left side of my chest, beneath my rib cage. I feel constant pressure, and it's difficult to breathe deeply. I have shortness of breath, and I get dizzy/ light headed sometimes. The pain shoots down my left arm. Today, I feel it in my back, as well. Yesterday, I had a nuclear stress test, the pain increased AFTER my heart rate was supposed to drop. Therefore, my heart rate didn't slow down, and my BP wasn't elevated. They had to inject me with something to slow my heart rate; it still took several minutes to get it below 100 bpm. I feel like the cardiologist is being dismissive because I don't smoke, I'm not obese, nor do I have hypertension or high cholesterol. However, I'm a type-A personality, and I have a high stress job (middle school English teacher). I've always been high-strung, and I have a history of anxiety dating back to childhood. I also suffer from Raynaud's and migraines.