Poor HND - that is a long hospital stay, I imagine that is more for the recon surgery than the actual mastectomy? - but probably just as well if you have young children. Drains - horrid, but hopefully you will get rid of them long before you come home, so won't have to carry them round with you in a stylish hospital drain handbag!
AtoZ - I echo what topsy says - MacMillan very good at sorting all that kind of thing out - makes me cross when people who obviously have a serious illness keep getting messed about and have to go begging for their rights.
Pen - complications of these things are scary, but chances are you will be fine, and its good that its been moved forward - less time to worry
If its any help, I have a very good friend who has had 12 ops for throat cancer, and she has come through and is fighting fit - her voice is slightly husky, and she lost it for a little while after each op. but got it back after a few weeks.
Ned - hope day one back at work was a good one and you are not too tired, - well done you, its a big step - have been thinking about you all day 
jane - you are not a fraud at all, you've been through cancer that's the big old curve ball we've all been thrown - treatment is different for everyone there's no top trumps treatments
, you are very much part of our little family. 
Now - guess what - DH has got his winning streak back - he came home from work and said 'I've won you a late Christmas present in a prize draw' - it's a Kindle!! - I'm so excited, can't wait for it to arrive. Will have to send him out for lottery tickets on Saturday 