When I'm in a place such as work and I'm thinking about all the things I want to do, I'll get really excited and my mind will go almost hyperactive but when I sit down to actually do the thing I've usually exhausted myself from all of the thinking I've done and it's very frustrating. Should I try to think about other things when I'm not able to access a keyboard or notebook?
what i think you should do is find a simple relaxing activity to do, in your workspace, to calm your mind down and get back to your normal self