I've been having this sharp pain in the right side of my chest, kind of around the upper chest near the ribs or maybe just below. It started yesterday morning and sometimes it feels like a stabbing sensation when I breathe. These cramps come and go all day, and I must feel them around 35 times a day. The rest of the time, there's just this discomfort. I'm getting pretty worried. What could this be, and should I do something about it?