This started about 6 hours ago and has only gotten a little better. I am a 27 year old female I had a sudden pain and I literally thought I was having a heart attack. Every time I breathe in deep I have a sharp pain right under my chest at the top of my ribs on the left side and have no idea why. It is worse when i sit up or try to sleep ok my left side. Has anyoje ever had This happen. It is very scary and will probably go to the walk in tomorrow morning