Something is missing
This nagging feeling of having forgotten something can be a blessing or a curse, depending on the overall reliability of your memory. Personally, when I get this feeling, I rack my brain for a certain amount of time and, if that doesn’t work, I push it out of my mind. And THEN, after a couple of minutes, I remember! At least 34.7% of the time. The other 65.3% of the time, I remember when I’m already too far down the road or at my destination. But then I’m not responsible for piloting and aircraft, so a little hit and miss is okay.
A vital strategy of mine is to outsource my memory to paper or, more recently, to my phone. I have an app where I can manage to-do-lists on my phone and my computer and they are automatically synchronized. It’s great! In the olden times, I would have my paper-based lists, usually a big sheet of paper with a to-do-list for today, for later, for various projects, a shopping list, etc. etc. and every so often would have to write a new sheet and transfer the usually enormous amount of unchecked items. Things are so much better now!
Of course, if I don’t put “toothbrush” on that awesome electronic list, there’s a non-zero chance that I’ll actually forget to pack one, like on our last vacation trip, haha!