Crushing sensation in chest..again

This is the 4th time Ive felt it in my lifetime. I seems to occur like twice a year. I think I better not ignore it any longer. =/

It feels really painful and uncomfortable. The feeling is as if your insides are being crushed, and theres this stinging pain coming from the inside.

Its felt from my upper chest all the way to my upper stomach area. I feel momentarily weak and at some occasions, drowsy and faintish. It usually lasts around 5 minutes.

Gosh..what is happening to me?

First a genital infection, then a sprained muscle, now a recurring chest pain...