Hi there. As long as I could remember, sometimes my heart and the close areas around it would be in a sharp pain, like a knife or something squeezing the life out of it. This usually lasts for only 10 seconds, and during that time it hurts to breathe in. Other times, my left side of my head would throb with pain (it s always been my left side). This would happen for every couple of days or so, but I don t understand why, and the doctors have found nothing out of the ordinary.