I'm 22 years and about a week ago, i experienced my first anxiety attack. I had been stressed all day. 2 days ago, i woke up with pain on my left side, under my breast. It was on and off during the day. Night time came, i couldn't sleep. I had a tingly feeling in my arm, thought I was going to have a heart attack. Following morning, i went to the ER. I had an ECG and chest xray and everything is normal. Doctor said it could be due to stress. She diagnosed me Paresthesia and pain of left extremity. Next day I still feel the same, i feel sore. Could this be stress or something worse? I still get scared it could be a heart attack I am really freaking out!!