I feel you! Oh, I do! I have been posting about my terrible memory and how it is stress related!
I'll tell you, this is a GREAT opportunity (I know it doesn't feel great) to be gentle with yourself. It is an opportunity for self love. (I know you are feeling unloveable), but there is a part of you that is the nurturing parent or the wise woman or your HP or whatever you want that LOVES you and KNOWS you are good and okay and are allowed to make mistakes, however big.
So FIND her or experiment what she WOULD say to you if you can't find her yet.
She would say, "You are human. You have a huge heart. You are good and kind. It is okay to screw up. It is normal. The universe is big enough for your mistakes. You got something good out of it - that is to observe the stress from dealing with your AH. That's fine. That's good to know. Now breathe. Stop beating yourself up. Breathe. Feel how loved and safe and okay you are..."
Build your relationship to the one that will nurture you. She will serve you well throughout your life.
Hugs,
peace