I overworked myself. For the past 5 years, I barely took a day off. I shipped 30 startups, wrote 30,000 tweets, made 70 YouTube videos, and answered thousands of support requests. The weird part is, it never felt like work. It felt like play. Until recently. For the first time in years, I’ve struggled to get things done. I don’t want to open my laptop. The things that used to make me happy suddenly feel heavy. That scares me a bit, because the playful side of work is what got me here. And…