What Causes Discomfort In Chest And Neck?

I started having some kind of strange feeling a little while ago - an hour or two. It now feels like a sort of pain, but I can t say that it is sharp or dull for sure. It seems to be mostly located in the upper center area of my chest & now I feel some discomfort just under my jaw - under my chin & mostly just under both points at the back of jaw near my neck. It almost feels like a cooling sensation when I breathe in. If I force myself to burp, it seems to stop during the burp. It seems to be more uncomfortable when I lay down or bend over from a standing position.