My fog is not being able to pull out the words that I know are in my head, not being able to figure simple things out, and being forgetful. Those are the three most prevelant things that happen to me.
The word thing happens to me alot...I've learned that when I can't figure out the word, to start explaining it...and usually the person I'm talking to can figure out the word for me. I've been brutally honest with my family and co-workers...just letting them know what is happening and why...so they don't have that "is she nuts?" reaction...they just jump right in and try to help me figure out what the heck I'm trying to say!
The "not being able to figure things out" is like the day I stood in the kitchen holding a meat fork...and wasn't really sure where I was supposed to put it. I did eventually figure it out.
As for being forgetful...I have to write everything down. And, if someone wants me to remember something they said - THEY better write it down for me. LOL (I highly recommend investing in a dry erase board!)
Some days it is more frustrating than others. And, I would agree that the level of fog is directly related to being tired, etc.