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Forgetting
(lemmy.dbzer0.com)
More seriously, ADHD, among others, is a working memory disorder. A way to cover this is to use "prosthetics" for it, such as a notepad that you always carry with you. If this affects you strongly, train your muscle memory to use it to note down what you were planning to do and to refer to it when you forgot.
In PC-speak, ADHDers have traded RAM for more CPU.
I started using todoist for this and it helped a lot.
(I'm not trying to shill this product, but I am trying to shill the idea - I'm sure there are a ton of similar products out there.)
I use it in the "getting things done" method where you drop every little thing you need to remember in the inbox and go through the inbox once a day to organize your thoughts into whatever project or container they need to be in. It has immensely improved my life and the underlying feeling of dread that you missed or forgot to do something.