I just had one of those last night. I've never had one of those before and I'm a little freaked. It was one of the worst pains I've ever felt. I couldn't breathe or move.... I was afraid to move. It felt like something was twisting and turning under my left breast and I felt it all the way back into my left shoulder blade. I'm also very sore today. I put heat on it and it seemed to help but I'm scared to death to have that happen again. I eat bananas all the time and I take vitamins. I'm wondering if I go see the doctor if it will just be a waste of time. I'm sorry to hear that it's happened to you 4 times now. Let me know if you get any answers!
I have major deep body charlie horses, even under rib cage, that come frequently now post surgery if I don't take my potassium -- Klor-Con: 10 mcg or something like that. It's a prescription dose. Also, magnesium is important. I would get checked out for a heart attack but it sounds likes like severe potassium deficiency. If you're on a diuretic, you definitely need to supplement with Klor-Con.