So sorry to hear your news Sharon, those first few weeks are the worst all that waiting and wondering what's next, It consumes your every thought and action.
Well done on getting out for a walk it really does give your head a rest for an hour. I did the same thing walking going to the gym and cycling all with the purpose of distraction. The last week before surgery I couldn't do anything but people kept saying be kind to yourself and its true.
I had a right mastectomy and was up and walking around the hospital the next morning!! I walked almost everyday when I got home sometimes only around the block but being outside is a wonderful thing. I went back to work on light duties after two weeks, I just wanted everything to be normal again and I can understand your need to work at this time. In hindsight I went back a bit too soon...
I started Aqua classes around Xmas and have just gone back to the gym modified exercises no chest. This was about 8 weeks after surgery.
Take care of yourself and be kind your going through a big upheaval,
Louise