I used to have more significant issues with losing/forgetting things, but they eased after certain medications were discontinued, I adjusted to them (like Seroquel sedation), and my illness fog cleared. If I recall correctly, Lamictal and Lithium were the main culprits for me. I've been off Lithium for some years now. I do still take some Lamictal, but a small enough dose that it gives me no discernable side effects.

When I'm under stress, like doing multiple things quickly with deadlines, I sometimes forget things. My most notable issue lately has been leaving a gas stove burner on, especially if on low flame. I've also left the oven on. I try to make a habit of checking these...off, off, off, off, off.