I also had a mast w/tissue expansion. I never needed heavy pain killers and did not have to take what they sent home with me.
I was able to drive fairly soon too.
My tissue expander felt weird only because it was up so high in the chest area and because the area was numb. The fill appointments were quick and relatively painless. I did have to take extra strength tylenol after the later fills were completed as the area would become sore due to the amount of fluid he injected. But that is all done now and I have had the permenant implant for almost a year now. Glad it is over with, but it really was a not bad experience. Long, but not bad.
It sounds like you are doing very well. Keep it up. But......do take this week to rest. I always overdo because I feel good, but I sometimes have delayed healing because I was to active. Take advantage of the rest time.
Two are better than one, because they have a good return for their work: if one falls down, his friend can help him up. Ecclesiastes 4:9-10