@Pamela - I had bilateral mast 11/8 with immediate reconstruction w/tissue expanders too. I was expecting some pain afterwards and wanted to share my thoughts with you.   Immediate pain - my post-op pain was on my right side (this confused me a bit because the sentinel nodes they removed to test for cancer was on the left). I later found out that I has some bleeding on the right side during the operation, which I attribute to the pain now - kinda like an internal bruise, painful if your gonna go out and use a shovel, but manageable with rest and some meds. Pain would be about 3-4 on a childbirth scale, totally local.   Managing pain - I started with 1 percocet when the pain ramped up. The nurse talked me into trying 2 after seeing me wincing in pain while trying to sleep (about a 7 on the scale). I didn't get relief and mentioned to a floating nurse that it seemed to be muscular. She said that some PS will prescribe muscle relaxers and contacted them to get an order. I will say, I experienced immediate relief! I know the PS only put the minimum 50ccs in during surgery, so I was surprised of the pain. But think, your stretching a muscle that has been there for how many years happily doing it's thing?   I used percocet as needed 5 days post op - flexirol for ?? days & the days of fills. hope this helps you :)