Overthinking is simply the act of thinking about something too much or for too long. I know the feeling, and it's energy-draining. Overthinking elevates your stress levels, reduces your creativity, clouds your judgement and strips you of your power to make decisions.
Fortunately, there are a few ways to handle overthinking. These don't happen overnight -some will take time to develop and some can be implemented immediately. But all of them require conscious work from your side.