I am a healthy 83-year old woman. Right now(and for the past 4 or 5 hours, I have been feeling a pain just under my ribcage on the left side, right below my waist. It is most severe when I breathe deeply, or when I raise my chest. I had this kind of pain several months ago, but it abated after a couple of hours. This time it seems to be getting worse, and hasn t abated. What could it be? Should I just wait for it to pass,or see my doctor ASAP?