I saw the surgeon this morning. ALL CLEAR, and NO knives!
It was just a cyst, and he was able to drain most of it out using a needle and ultrasound. Only a small spot remains, and he highly suspects it's just me.
I'll have a mammogram to confirm this, but he told me to go ahead and smack my doc upside the head for scaring my husband and friends.
Thank you all so much for your prayers and concern.