Sometimes it is the simple things that can help.
I recently got a dry erase board with a magnet that attaches to my refrigerator. It has become my new organizational and anti-brain fog tool. My memory used to be pretty amazing. I was even resistant to keeping a calendar, but now lists are a must for me.
I have been using it to write down the simplest tasks that need to get done--even loading and unloading the dishwasher, taking out the trash, and basic errands to the market and pharmacy. It helps me remember and also adds a sense of accomplishment to those days when I am exhausted and can't do much. If I just check one or even two items of the list, the day doesn't feel like a waste. I am thinking of getting another one strictly for my medical related to do lists. Obviously, creating new lists and making any changes to an existing one is easy. And the the best part is that it is stuck to the refrigerator so unlike a notebook, I can't forget where I left it!
Here's a link to the one that I have and it is pictured above, but any will do.