If you are in a similar boat, it's likely that when you consider an upcoming dreaded task, there is at least a small part of you that admits the possibility that you will not do the task . And because there is, and because your brain realizes it, it expends mental energy trying to convince you not to do it. Once you are actually doing the task, or it's done, or you realize that you must start doing it immediately, yo…
And then my brain realizes that that's actually true, it's being silly by procrastinating, and I get to work.
It's strange that it's necessary, but it is.