First things first, speak to the GP
Write a list of 3 people to call if you need to, this could include the Samaritans.
Be kind to yourself, you are not failing as you are still here, you are going to get through this.
Think of something that you can manage that will distract you, I play stardew valley. Or maybe a mobile game, knitting, crochet, jigsaw, puzzle book. A nice warm drink to go with it. Give yourself permission to have that time to relax.
Make a list, put it down and then go for a short walk or just sit and focus on your breath for a time, look at the list again and see what is the quickest thing on it to do, do that and cross it off.
Look at yourself in the mirror and say well done for doing it, you will feel completely ridiculous but give it a go.
Set a timer for 10 minutes and try and complete something else. Praise yourself and then take a break, read a book, come on here.
Repeat as you feel able to.
Plan your calendar, something may have to be dropped, there are only so many hours in the day.
Before you go to bed spend some time writing everything that is whirring in your head, it doesn't need to make sense but just put it on paper. Tell yourself you will do some of it tomorrow but now you are resting.
You can do this, if you couldn't you wouldn't of posted, you have the strength to get through this.