Suggest Remedy For Pain Above The Breast

hi I am 25years old female and I have a pain on the upper left side obove the brest and it sometimes hurts to breath it feels sore at times it comes on and last about 5 days and then goes away and than comes back weeks later at first I thought it was my heart but that is to high for it to be my heart I think? any sujestions or ideas of what this could be?