Anxiety

I just started a new job almost 2 months now, everything is going well but one day I'm sitting and I feel my chest get tight and I feel this anxiety attack out of nowhere. I don't know why or how, and it gets worse when I am on the bus I take to get home, my heart starts beating fast and I start panicking. I don't know what to do or how to control it because these are normal activities I do on a day to day basis but it just got weird. On top of this, I can hardly sleep especially when it comes to weekends. I am just at my witts end and I get more anxiety and stress thinking about it

-Anonymous