I would be a bit more concerned with the swelling of the lymph nodes. You do have those in your breasts. It means that your lymphy system is backed up a bit and you are immuno compromised. If you haven't already...put the anitbiotics aside for the time being and go see a chiropractor or a relfexologist and see what they say.
I had a backed up immune system (many years ago) and I was put on so many antibiotics, tec that I probably could have opened my own pharmacy (although my doctors had no clue what it was...and just kept prescribing more and more drugs). Nothing helped it...it finally went away after 6 months (and many, many side effects later).
Fast forward to a year ago, when my lymph system backed up again (swollen lymph glands) I went to a reflexologist and a chiropractor and learned what it was, what causes it, and how to treat it drug free. So, the first scenario I was out of commission for 6 months!!! The second time, it took a few weeks of regular massages (which I still do on a daily basis) and it was all gone.
I would strongly urge you to go see a chiropractor and/or a reflexologist.
Hope you're feeling better soon!