Suggest Remedy For Pain Under The Breast Upon Lifting Objects

I had a muscle spasm under my right breast while trying to untangle myself in my sleeping bag. It hurt a lot at the time. Now it is over a week later and I am finding that I have pain when lifting or pulling objects. It feels as though there is bubbling below the surface under my rib cage. I am having trouble getting comfortable and fear that I did some damage to my ribs.