Being a CTO and doing dev creates a ton of cognitive dissonance that takes a lot of mental energy to process. I would look for mentors who can talk you down off the ledge when needed, and help you establish habbits and rituals to better separate the areas of concern in your day to day life.

Also appreciate that most thoughtful engineers are their own worst enemy. Its a sign that you're good that you even care. Find a way to taper back your own self-criticisms because after a certain point they are inaccurate and not helpful.