I think this is something most people suffer from to some extent. That feeling that you're not quite up to the job but no one seems to have realised.
I suffer terribly. I have a responsible job which people seem to think I do well, my appraisals are always good and I almost always keep all the balls in the air. It doesn't "consume" me but I do have a slight niggle that it's only a matter of time before they all realise I'm making it up as I go along.
Can you imagine being Matt Hancock or any of the rest of them at the moment? 