I use tanglo app (tanglo.app) and something about just clicking "start" on a small task is enough to break the cycle for me. Tanglo is also helpful in visualizing what I can REALISTICALLY get done in my day and what happens if I don't start.

When I don't start a scheduled task, it just keeps pushing it down further and further. If I procrastinate too long, tasks at the end get moved to tomorrow automatically. Which sucks. Small steps, click start.