Well i see those as two separate problems. To focus get a pot of coffee, put headphones on loud enough to tune out any outside noise, and lock the door. As for procrastination lean into the damn skid, go find something you like to do and come back later. The longer you fight it the more unproductive time you're going to have, and in my experience i get more done in 3 productive hours than i do in 8 unproductive hours