The brain protects us. Adrenaline kicks in, fight or flight etc, and that carries us through the intial course of action. It's only later that our psyche allows some of the other emotions through. I'm 19 months post diagnosis and sometimes I still have to metaphorically pinch myself that this has all been real.
Allow yourself to feel the emotions. Avoidance can lead to problems down the line. So cry if you need to, or rage, or laugh at the absurdity. It's all good. If you feel yourself getting stuck at any point, a bit of counselling might be good. There are counsellors available at the Maroondah Breast and Cancer Centre. Joining a support group might be helpful too. Or hang out here with us!
The feeling that we have lost control of our lives is almost universal upon the diagnosis of BC. Take some deep breaths, practice some mindfulness, meditate, whatever gives you some mental space. It's a rollercoaster this BC. You will manage the ride in your own way. Big hug, K xox