I'm sure everyone has been there, the point where your brain just shuts down and stops caring as much. I find it almost peaceful to be honest. I am exhausted, at work and just truly care about 1/2 as much as before. I also suspect that there is some background conversations going on about me at work - but am choosing to ignore and just don't care (trust me this place is full of tongue waggers so it doesn't surprise me, previously I would have been really bothered by it being directed at me). I'm letting my husband deal with this now how he has too, letting him believe what he wants to, and don't have the energy to fight about anything anymore.
Don't mistake this for being a push-over, it's much different. I will stand up for myself if necessary, I'm just mentally in a better space where everything just doesn't bother me as much.
So the one advantage to CFS that I have, the nice exhausted buffer it puts around your brain :-)