Hi Dianne,
Tough one indeed! That blue injection is no fun ...
Mastectomy is good and the date is not too far away, so do what ever helps you to relax? Long walks, chat with friends, read, music, garden, long hot bath - whatever feels good you deserve the treat!
I had a mastectomy and am glad that parts over. For me it feels better to know its all gone (for now anyway). The process is tough but you'll find support in places you least expect it. Be strong, ask for what you need and know that you are special!
Take care, k