DBT has a section called Distress Tolerance. It teaches skills that allow for distancing from the anxiety to get one's mind off it for short times. Like for me it was watching a movie on my computer or taking a hot shower or cleaning my house or wirkibg on a craft project. Anything that took my mind iff of building up the anxiety to a higher level by focusibg in it continuosly.

Some people do breathing but that never worked for me. The mind can not focus on 2 things at the same time. Just like a computer it can only time share....a computer gives time slices when multiple processes are being done....our mind works the same way so when we give a time slice to another activity that requires our focus it gives less time to think on what our anxuety could normally build up.