I must admit the drain thing made me feel a little sick at first, or was it the anesthetic gas which as it turned out I am allergic to? I had a single mastectomy and had one drain. It was an overnight stay for me and I had self dissolving stitches and a broad tape over those.
I finally got the drain out after a week or two and I had to go back to surgery for an axillary clearance and got a drain for that too. Still an over night stay but no gas this time so no night of hurling my insides up into a bag. Again self dissolving stitches and some tape.
The biggest thing - painkillers. Make sure you get them from the hospital before you leave. Targin was a good one for me on the second op. On the first one I tried to tough it out with panadol and nurofen. Big mistake.