Fast Heart Rate Sore Left Arm PLEASE HELP!!!!!!!!! Plz?

PLEASE HELP!!!!!!!!! plz? - fast heart rate sore left arm

If I need a little push on my part of the upper back of the lungs with pain, how it hurts when I scratch with my left arm! What could b? his pain @ times .. @ Note sometimes an increase in heart rate and can only breathe sometimes! plz help me had a scanner a year ago and my lungs could something so good it's easy?