I'm 22 years old. I'm 5'2 weigh 125 lbs. My resting heart rate is usually around 150s. I have had a stress test, echo, multiple ECGs; everything is "normal", sinus tachycardia. I sometimes have chest pain with numbness in my left arm and hand. I have been told I was "imagining" my signs/symptoms. I highly disagree. I have turned very pale during a chest pain episode. I am a nurse and was at work when it happened, went to the ER with no explanation. I also suffer from migraines. I'm not sure if they are related. I take toprol 100mg daily, nortriptyline 75mg daily, and birth control (seasonique). Any ideas what could be wrong?