When I get in that bind I remember my history and that I usually get things done on time that I "have to" get done. Realizing that allows me to relax a bit and quit stressing and accenting the procrastinating and live more in the moment.

So, I grab something I am supposed to read or something I want to read to help me with the task, etc. I get "started" in some way that I enjoy and, once I'm caught up in the task, I usually work on it awhile/until I finish it.

Another tactic is to list it all and plan it all, just get it all out on paper, a plan, and that gets it out of your head where the "so much" is not swirling around in there where you're unable to swat at it and keep it still