About 3 weeks ago I picked up my 1 year old grandson and felt my left rib spasm. It seemed to get better about a week later, but then it suddenly begain hurting even more. Burning and throbbing in my left lower rib. The pain moved to under my breast. I went to the doc and he gave me meds for inflimation and possible shingles. I had no break out of shingles. The pain has since moved to the outside of my left breast and rib. I have another apt. Wed. What could it be????: