To start, good that you’re here looking for guidance and support. What you’re feeling (and not wanting to) is very normal. We’ve all been there.

I’m in month 4 post diagnosis, just finishing radiation and doing very well. IDC Stage 1a Grade 1 ER+ HER2-

What worked for me during those days of panic, anxiety and denial was the following.
Talking to friends/family who have successfully navigated through breast cancer and can offer words of encouragement and guidance.
I also talked to medical friends who were able to guide me to good practitioners.
I read about my type of breast cancer only, and tried to stay away from others because there’s only so much you can take in. For me, knowledge was comforting, but you need to determine if that’s true for you. Some people are more comfortable following what they’re told by the docs without doing a lot of their own research.
Try to stay in the present rather than getting too far ahead of yourself. It will all play out the way it does. There will be more waiting and decision making than you think you can handle but you’ll get through it. Worrying won’t change any of the results. I read Eckhart Tolle and find his philosophy extremely helpful for staying in the now. If he’s not for you, finding someone or something that is; religion, etc. can provide comfort.
Work on accepting the truth of having cancer (takes time) but don’t let it define you. Do normal things, give yourself grace and find support wherever you can, including anxiety meds or therapy, even if temporarily to get you over the hump.

Best wishes. ♥️