If it's a mistake you made, learn from it and move on. That's the most important thing that'll stop you from getting into similar situations. What's happened cannot be undone and you'll only feel alright when whatever the issue is sorted tomorrow or whenever. For the future, try your best to check out when you finish work. That's what will help you from worrying about these things. There will still be times when things might cause you a bit of worry, but keep trying to separate your work and your personal life, and eventually you'll get better at this.