Create a plan.

Write something down ... on paper in black and white (or blue or purple, whatever you like) & put it up somewhere where you see it easily & often.

Make this a 1-2-3 kind of list. Once you have something practical that you know you can do, some of your anxiety should start to ease. If you will begin to chip away at your list, the anxiety will continue to lessen.

Of course the list needs to be practical to begin with. When you finished it, look it over and sort it out for order ... What do you need to do first, second, etc. Then decide whether these are things you can realistically accomplish in the time remaining. If they are, there's nothing to be anxious about.