I am so sorry you are here, but glad you found the site. The people here are amazing and so supportive.
I echo what the previous poster said, definitely get tested for Lynch! The family history and your age at diagnosis are huge red flags. It is something you need to know.
What you are feeling is completely normal, especially right now while you are waiting for the full picture. Don't bottle it up, you need to have at least one person you can say anything and everything to. My husband was my rock those first few months while everything was getting sorted out, and he still is now.
We were age appropriately honest with the kids. I was pretty sick before we got the diagnosis so they knew something was wrong anyway. They have handled it pretty well, if anything it has made our family stronger. We fight this together, they give me the strength and purpose to keep going.
Don't worry about being brave. I always say one day at a time. Some days I do better than others. Most importantly it is ok to cry! It actually helps a lot to get it out.