First of all.....so great that you found this website and this group of people. Everyone here "gets it" - the concept of being drafted into a club you never wanted to join, confusion about the barage of new information, the, quickfire biopsies, surgeries, imaging, doctor appointments, tests, and the many, MANY important choices you have to make right after diagnosis, involving percentages of your long term survival. It's so frightening. And it's natural and ok to feel it - we ALL do.
One thing I'm realizing is that we are in fact human. Our bodies are not completely under our control, but a huge part of coping in this fight has to do with something we can control - our attitude and our minds. IT IS NOT EASY. I've always been the person people describe as "You're so strong! You're so positive! You have such an incredible attitude!" And actually, I normally am. (Or was, before I got the news that a microscopic monster was in my body and could rear it's ugly head at any time. But then again, it might not.) That's a brand new life experience for me.
I'm scared, and sad, and hopeful. Every day. And that's normal. People don 't really understand that until they've gone through it.
So I do my best to be agressive about keeping my mind in the right place. Meditation, exercise, yoga, and all that good stuff to be sure. But also educating myself, researching from GOOD responsible sources, stopping and making sure I take time to appreciate something simple and beautiful every. Single. Day. I'm rewiring my brain to be my useful in this fight. That includes something new: allowing myself to cry. Cry hard. Not often, but whenever I need to. (I try to do this in private.) My late Mom used to tell me that it's not only ok, but it's important to cry now and then. It gets the toxins out. I now see what she was talking about........and I always feel better!
And always remember YOU ARE NOT ALONE. We're all here. Pop in whenever you need to.

And good luck on this road. It's a long one, and a tough one, but we've all got your back.