My memory is awful because of my depression. If i do not write it down i WILL forget.
I am keeping 3 different calendars so i always have something to write it down in and i update them all everyday.
To remember the stuff that doesn’t have a date i have stuck clothe clips on my upper shelf on my desk. Then i use notes and hang them there so i can always see them.
Don’t feel bad about forgetting something. It can’t be helped when you are stressed. All you can do is write it down and hope you look at it.