Have you made a physical list of all the things you need to do, or is it all in your head? I find that writing down my to-do list to start makes things more manageable because it's one thing less to do, which is to remember the list to begin with!
Once everything is out of my head I try and look to see if there is anything that I can do at the same time, or things with overlapping tasks, similar locations (if I have to run errands outside the house), or maybe just things that are the same but for some reason I'm my mind I just kept them as separate tasks. Sometimes I can make my list shorter by just combining things.
From there I usually try and see if there are any tasks that will take me give minutes or less, I do a task, I physically cross it off the list. The relief that I feel from physically crossing something off my list is amazing. And it's incredible how much you can sometimes shorten your list by getting rid of those little 5 minutes tasks.
After I do the little five minute tasks, then I move up to longer tasks little by little until they're all crossed off.
Best of luck, you've got this!