I had anxiety before the diagnosis, so I totally understand. You are allowed to feel whatever you feel. If that means walking in hysterics, that is totally acceptable. You are dealing with trauma on trauma. Cry when you need to , at the store, on the street, get it out. When my mother passed, I cried almost constantly for months. Our grief, for our lost loved ones, for our own worries when dealing with cancer, are acceptable and human.
Cry when you need to. Don't worry what others may think, perhaps a kind person will come and comfort, and sympathize, or if not, that's okay too. (((((((Hugs Hugs Hugs))))))))))