Hi Naomi - it is natural to feel a bit down in the dumps - it's a huge adjustment to go through, mastectomy, expander and chemo and all the other poking and prodding. Don't feel that you should be strong all the time. Yes an inner strength comes when you need it but you're also in turmoil coming to terms with it all so yes there is a feeling down occasionally.
As to everything hurting, it is still early days and aches and pains turn up in what I consider to be most unexpected places. The pad of my right foot gives me curry but more so when I am tired out. Long distance from my left breast I know but it's all about the side effects and the body adjusting. And my left breast still aches occasionally, especially if the weather turns!
Be kind to yourself and remember we all react differently to treatment. Your Breast Care Nurse is a great source of help
Take care from Christine xx