I'm a 28 year old female, and the upper middle and left side of my chest constantly feels bruised, my upper back hurts 70% of the time, and occasionally i get an electric shock feeling in my heart that goes up to my neck/shoulder. I've seen a dr once and was told its nothing, but I'm worried because its been happening more often. Any answers or help would be greatly appreciated, it freaks the crap out of me!!