HELP!! Reoccuring pain behind right breast, under rib cage, pelvic bone - RIGHT SIDE

Hi, I'm a 26 year old female...had 3 pregnancies, one miscarriage...
I've had a sharp, stabbing pain behind/in the center of my right breast for a LONG TIME (like, maybe a couple to several years?). There's no lump... It happens just about daily - sometimes several times a day. Sometimes the pain is very sharp & painful, other times it flares up just a bit... Possible it happens most after meals?
The pain just under my right ribcage is also sharp & stabbing, but sometimes also feels like a burning pain - feels like it's just under the skin. Had it for several years, too. Can't feel anything abnormal there either. I asked the doctor about this once, and she just said it was probably a pinched nerve (I was very pregnant at the time), but it had happened before my pregnancy, and it's going on now 6 months after my son's birth.) Possible it happens most after meals?
The pain on the right side of my pelvic bone (okay, I don't know a whole lot about my anatomy down there - it's the top right "corner"/edge of the bone, closest to the hip bone, if that makes any sense) is also a sharp, stabbing pain. This occurs the least frequently, but still often enough (and on the SAME SIDE) that it scares me to death!
Has anyone else ever had this happen before? What did you do? What happened? What was your diagnosis? Thanks so much!
A very frightened, Sarah