Hi Laurie,
I am so sad that you are going through this. I had a scare several years ago and can remember the feeling very well. It's a knot in your stomach that you think will never go away. Keep good thoughts though because it could be just a cyst, or a swollen duct as mine was. Don't borrow trouble as my Mom would say.
Tell your son. He sounds like a great young man and he will be the support you need right now.
Keeping you in my prayers and sending warm hugs.