Great that you now have clear margin and will not need Chemo or radiation! You are now cancer free! Hopefully the drain issue gets sorted today.
I had a mastectomy back in May and my drain never worked. Three days after the op it started leaking blood etc around exit area and so the surgeon removed it and manually drained the area. I then had to have it drained a few times using a needle over a few weeks post op. All of this was painless and I never developed an infection or anything. All good now.
Hope you recover quickly.
Deanne xx