Breast cancer diagnosis

I was diagnosed with invasive ductal breast cancer 2 weeks ago. Er + HER2- and spread to one lymph node.  I am booked for double mastectomy in 6 weeks time but since my diagnosis it’s gone all flat.  I was being strong at first. It was fresh, new, scary but felt I had fight.  Today I feel numb like the initial diagnosis wore off and now it’s real.  I’m moody, flat and exhausted and scared about it spreading or life after surgery and what happens next. All the waiting is draining