I wish my anxiety wasn't at its height as soon as I wake up. Ive been losing so much sleep and its killing me.

I used to be able to fall back asleep if I woke up in the middle of the night, but I cant now for the life of me. Every morning I wake up at like 3-5 AM and immediately start stressing about various things I need to do. Oh, I have to remember to do this thing at work. I have to remember to mail that birthday card. Shit, did I remember to drop off that package? And on and on and on until I can't even keep my eyes closed and I'm completely awake. 

Does anyone else struggle with this? I feel like by the end of my day I'm so tired that I don't feel especially anxious. Then I can fall asleep pretty easily, but I get terrible sleep and not nearly enough of it.

I would feel better if it was one thing stressing me out, like an event coming up, or a specific task I need to do. But the problem is its so general. Im an adult, and part of being an adult is having an endless stream of responsibilities, so I HAVE to adapt. But what do I do when every single task I need to do in my day stresses me out from the second I wake up?