Every online assessment timer makes my hands cold, found a five minute routine before starting that actually helps

The second that countdown clock appears my hands go cold and my brain does this thing where it forgets basic syntax for a solid minute. Started doing a dumb five minute routine before every OA now: close the tab, stand up, do a few slow breaths, write down the one thing I'm most worried about on paper, then start. Doesn't fix the anxiety completely but it's stopped the first five minutes from being a total wash.