How about taking that nap you're craving? Just 20 minutes might help you feel a bit more centered.
I've been through periods of exhaustion, especially after going to court for custody and then for my divorce. I'd distanced myself from XAH but then suddenly, I had to deal with issues pertaining to him, and my body reacted a lot.
My only advice to you is to listen to your body. Sleep more, eat well, and give yourself a big old break.