I've just focussed on work all day today, and tried to almost put pressure on myself with it, so my mind is worrying about something real.
This is the first time anxiety has ever affected my sleep, and it's horrible. Every evening, I go for a run about 7ish, then I have a shower about 10ish, then I try and wind down for bed, by just reminding myself that I've done the day, and hope that settles me... doesn't always.
My overwhelming feeling is just one of confusion. About anything and everything around me. Running is like my form of meditation, I concentrate on the feeling of my feet hitting the ground and the rhythmic movement and just let everything else come and go. If I can't tolerate the thoughts, I sometimes pop an audiobook in my headphones and try and get lost in it.
This is the closest thing I've found to explain how I'm feeling...
https://anxietynomore.co.uk/anxiety-mental-exhaustion/ and it reassures me, as 'mental exhaustion' is far less scary than what I assume is happening.