How do I cope with anxiety after being diagnosed with breast cancer?

So on October 16,2025.i was told I had breast cancer before my biopsy, from my healthcare provider,so after biopsy I was told they found 2 cancer in my left breast.i was so scared anxiety set in, like never before.after biopsy my doctor said I would have to have surgery chemo then they would tell me my stage..moving forward i couldn't sleep think it was a life changing experience in my life.so i met with my oncologist, first he also said that I have 2 masks that are cancerous and recommend I get the whole breast moved because they see other small mass around.he also said I was stage 1b.before i could do surgery i have a lot of test to take. P.ET scan bone scan genetic test blood work mri so moving forward I met with the surgeon he really didn't know what was going on with me I had to fill him in smh but anyway he also recommend I get the whole breast removed and before surgery I would need to see the cardiologist and get mri of both breast part 2 on next conversation