Going outside in sunlight and walking to a park is my healthiest trick.  But my most effective trick is going to a cafe &amp; ordering a Large Chocolate Mocha with 2 or 3 shots of coffee.  (Failing that, a chocolate ice cream sundae usually works too.)<p>When I was in Berlin, on the rare bad day, I would go to my closest train station, sit on a seat and watch the people go by.  Inevitably someone would come up and ask me for directions.  Helping someone even with my terrible German skills cheered me up.<p>These tricks aren&#x27;t long term fixes (walking &amp; sugary mochas won&#x27;t help you earn more money), but they might give enough of a short term boost that you can get back to working on something productive, and thinking about how to fix the bigger issues (improving relationships, finding a better job, making new friends etc).