It's so easy for anxiety to run away with itself, and snowball. Remind yourself one step at a time - dont need to tackle everything at once, can break it all down into smaller steps. Smaller steps are the key
When you are feeling anxious try some 7:11 breathing. (I have found it helps me) Ensuring you are breathing with your diaphragm (can see belly inflating not just chest), breathe in for count of 7, and then breathe out for count of 11. This engages our natural relaxation response. If 7:11 is hard can do lower numbers as long as the out breath is longer (i.e. count 3 in and count 5 out)
If you find you feel panicky atall, practising 7:11 breathing regularly, for 5-10 mins, should find its easier to do when starting to feel panicky, calming you much quicker
If feeling particularly anxious another way to try is to locate a rectangle in your environment, a window for example, and let your eyes follow the outline, breathing in for short length and out for longer breath. You may find that helps to engage/distract your mind xx