Firstly, confirm with someone who deals with breastfeeding medication wether or not you have to stop. There is a book called Hales which lists all the medications and what you can nurse with and what you can't.
If you need to dry yourself up, you can use cabbage leaves right on your breasts to help with the engorgement. Also certain foods will help, sage, and mint are two of them.
I don't have any suggestions for your son...sorry!