Talk to Cardiologist on Pains In The Left Arm And Chest

I was having sudden onsets of missed hearts beats or really fast heart beat with extreme anxiety. the chest, pain in the chest and left arm.i got my self checked from a cardiologist. My ECG, Echo and treadmill stress test are all clear. The doctor says that I have anxiety disorder. Buy the pain is real and it doesn't go away. I have pain in my back too on the left side. Like a pulled muscles. Stretching is a little difficult. I can carry weight easily. Climb stairs up and down easily. But that pain scares me.