If you, like me, have the type of brain that makes it hard to face huge problems that seem impossible to tackle (especially when there are so many frightening problems) here is my advice:

Set aside some specific amount of time to do what you hope will help. (Make phone calls, volunteer, inform, etc.) Daily, weekly, whatever you have spoons for. If your brain isn’t good with time, try tasks - three phone calls, etc.

Do it as early in the day as you are able.

Once it is done, give yourself permission to not think about the world again for the rest of the day. Think about anything else - your immediate to do list, something that makes you happy, a podcast you listen to all day in order to keep your mind from wandering, whatever it is.

If your mind keeps returning to the things that frighten and exhaust you regardless, don’t beat yourself up. But remind yourself that you are allowed to ignore these things for the rest of the day, and feel free use any coping methods that help you refocus or distract.

This may not work for everyone, but it helps me.