Hi, I m a 29 year old male.2 months ago I went to ER b/c I thought I was having a heart attack . I had sharp pulsating electric pain in my chest(right under the collar bone) that went to my neck,jaw, shoulder , and down my arm to my thumb . All test came back negitive for heart problems. The pain went away after a few days. NOW, 2 months later the pain had come back. I ve had it for the last 2 days. any info would help. thanks