lumps under skin

I have discovered over the last several months these lumps have formed underneath the skin below my breasts on both sides of my ribcage, they are almond shaped and slip around when I put my fingers on them, they seem to lie between the ribs on the surface of the muscle just under the skin, some of them hurt or burn once in a while and they seem to shrink or change shape a little too, it seems that they get worse as the day goes on and I sit at my desk for hours every day, so the ones on the front and sides (about 5 of them ) seem to get sore, some have even disappeared, but I have lost my health insurance and don't want to get run around and end up with thousands of unnecessary dr bills, what could they be or what kind of Doctor should I see, to get it right the first time..yikes..I have always been very healthy. I am female, age 55, at the end of menopause