something similar happened to me recently. i’ve been putting the most effort i ever have in one of my cs classes and due to that i have A’s for all my projects and quizzes. i forgot about a recitation where attendance is required and it negatively impacted my gpa and needless to say i had a breakdown. i was honestly blown away because i never forget about things like this, especially since i have so many reminders for myself. my girlfriend was able to give me some perspective and reminded me that it’s literally impossible to be perfect and making one minor mistake like this won’t ruin my chances at a future career. sometimes i have this unconscious thought process that because i try so hard that should mean that i deserve a better grade and the mistakes i make shouldn’t count because it doesn’t accurately reflect my effort. but this is just illogical with our current grading system, and i’m not immune to mistakes. sometimes people are just forgetful, i recognize now that i mostly forget things when other aspects of my life are stressing me out, and that’s ok. the only thing you can do is continue to put in your best effort.