Chest pains in left side of chest when laying down, especially when lying on my left side?

Question

I've had this problem since I was a child. Lying on my left side causes a major pain in my left side, pain stops me from breathing deep; makes me unable to move. It eventually goes away, the longest it's ever lasted is about an hour.

When I was in college I went to the ER after a major episode and they told me it had nothing to do with heart...any ideas what it might be?

I should also add that I'm 5'10 165lbs, and I run for 30 min 5 times a week. Didn't want to give you the idea that I was some fat, fast foot eating couch potatoe.

Answer 1

PLEASE GO TO THE ER IMMEDIATELY!!!! PLEASE