Wonderful news!! Herceptin usually causes no problems and hormonal treatment is a bit variable but overall it's all doable. My armpit belonged to someone else for a while after the axillary clearance, not so much swollen (a little bit) but numb. My mobility was great - probably unusually good, it takes a while in most cases, so keep up the exercises, that's the best you can do. Worth having a chat (do you have a breastcare or oncology nurse?) if the feeling of pressure doesn't abate in a couple of weeks. Best wishes.