Even if you could tell the difference, it will not change the fact that you have brain fog. Here are some times for coping. Recognize that you may never know the cause so stop ruminating about it. The more you ruminate the worse the fog gets and the worse your health gets from the stress of ruminating. Develop strategies to deal with difficult emotions. They add to fog as well. I suggest journaling, stream of consciousness every morning. Come up with practical strategies that work for you. I have my calendar on my phone and computer (Google) and I keep a paper calendar too. I have a white board on the inside of my front door. I write reminders there so I run into them when I am leaving. Get things ready the night before. Train yourself to put things away in their special places so you can find them. Put reminders in your calendars a week or two out from an event. Your cell phone is your best friend. Take a picture of where you parked your car. Make notes in the memo section as soon as you think of something. Take pictures of people you meet. The possibilities are endless. You can do this.

I like your answer. I use many of your tips. I wonder if it’s the meds, but these days I don’t feel free to ask my docs because they are being pressured to take away our meds.