There is a girl that I know that's a senior in High School at a nearby town and she has cancer and is supposed to be going through all of this too. I've experienced anxiety over the fact that she has it because for one, I think it's sad, and two I don't know her but ALOT of my pretty close friends from that school are good friends with her and I hate to see them down. And also, I experience ALOT of breathing problems myself with anxiety. In fact, just the other day I remembered one time when I was a little kid, I ran into the living room crying and screaming, "Mom, I can't breathe help!" And I now realize that I did in fact have anxiety quite badly as a child, I just sat it aside and forgot about it until I began to experience it again in the past couple of months. But, yes, it can definitely cause breathing problems.
Hope we all helped