Five hundred things need done. Now.
How do you manage to do everything you need to?
First, make a list. Doesn’t matter that something else needs done. Make a list. After you get that list done, look at it. Find the easiest darn thing on it. Do it.
Now, cross it off. Find another item. Do it. Cross it off. Keep it going until you either cross off the list or finish for the day. Anything left on the list, that’s the first task for the next round of work.
Don’t be overwhelmed. Don’t be crippled by anxiety. Deal with the pressure by doing.