Told today mastectomy of my right breast

It's just that I feel like I dont like to speak too much about it to my children (they are adults) because it stresses them out....and although my friends are very supportive....I dont like to talk too much about it either.....I go through all these scenarios in my head....yes at the moment it's only DCIS but umm til they check my nodes and do the wide excision...my mind goes off on these tangents....its the waiting that messes with your head x