[sailfast]

There are a lot of great deep, reflective answers in here. My advice is more tactical so take that for what it's worth.

1) Make sure there's a buffer before you get home from work, or if you work from home, create a buffer. During that time (could be as short as a half hour), do something that's not super stressful and not related to work that gets you thinking about stuff you're interested in. For awhile this was listening to audio books on the train ride home or doing crossword puzzles - as long as it decompresses you a bit.

2) Make sure you're sleeping enough. Fuses get short when you don't sleep and this fixes a lot of things.

3) If you're not working out or moving around, find something that you can do. If it's competitive maybe that helps. Squash, tennis, soccer league? Something that makes you run like crazy and gets your heart rate up.

4) Start work on that thing that's screaming at you from the inside because you're not doing whatever "it" is. Maybe something there - an idea, a project, a thing. What's been keeping you from working on it? Maybe life or your job seems to be preventing you from doing it? Start small. Talk to a few people and keep the fire burning. Learn more about it so you can start to think more strategically about approaches (or rule it out)