Brain Fog

Today is the day before my 4 in a row work schedule and I am dreading it.  Not because I don't want to work, but because I am hoping I can survive it.  My plan is to rest most of today so that maybe my energy reserves will take me through the next 4 days.  I am grateful to be working still. I really think the interactions I have at work are therapeutic for me otherwise I would be stuck in a house all day long.
It is difficult for me to get out of the house much on the days my husband works because I get so dizzy when I drive and sometimes when I am out and about my thoughts get all confused.  This is especially true when I am in an area with a lot of people around and in very busy areas.  Its almost like my brain can not decipher too much information at one time.  It gets overloaded really quickly.
When I go to the grocery store, I have to plan on what to get.  If I don't then it seems I wander around aimlessly trying to figure out and find what I am looking for.  I end up walking back and forth across the store, which leads me to be completely and utterly exhausted (mentally and physically).  By the time I get to the checkout, I must look like death warmed over.  I try not to carry on a conversation with the cashier as I am sure nothing I say would make very much sense.
If you ever have a conversation with me and I am exhausted, I would like to apologize ahead of time.  It is not that I don't find what you say interesting, it's that for some reason I can not process what you are saying.  I can't tell you how many times people have told me something and I have no idea what they have just said.  It is rather embarassing. I have always been told that I am a rather intelligent person, and I do consider myself to be for the most part, but lately my ability to absorb information is nill.
"He who asks a question is a fool for a minute; he who does not remains a fool forever."....Chinese Proverb