That ' s easy , something changes , you get into a slightly negative seeming situation , you have some thoughts about it that are negative maybe for the first time , this is novel so you return to them . rinse repeat add time and it ' s grown into a full blown habit spiral . Honestly , do yourself a favour it does no good to dwell on that , it ' s actually a symptom of the problem , just another spiraling loop of unproductive thought . In the sport of mountain biking it ' s well known that a common beginner mistake is looking where you don ' t want to go like riding down a narrow bridge and looking over the side instead of looking ahead , before you know it , you ' re off the bridge and upside down in the weeds . My advice is give your poor tired overworked brain a nervous system a rest and just focus on where you need to go and let the healing process commence .