I have been having pain under my right breast which feels like it's coming from the top of my rib cage! It's almost like I have a stitch in my side, you know like the ones you get from running after you've drank too much water? Only this has been going on now for about 3 days and has gotten a little worse in the evening time. I do take omeprasole for the treatment of GERD and did have a very bad stomach attack yesterday....which I haven't had for at least 4-5 months. I have had these same rib pains in the past but it's been a very long time ago and obviously they resolved themselves.....but what the heck is it?