It's called executive dysfunction, or exhaustion, depending on why you cant do. For the first, find ways to hold yourself accountable for doing things, and for the second, if you're able, take a few days off, two for rest, and one for getting some things done that you've been putting off

thank you. Definitely been over working recently and any day I do get off ends up being a catch up day so I'm always busy. Then I get hit by a brick wall and just can't get up. Will try what you said