I started working 10-12 hours a day 6 days a week. Now with a larger team I struggle to find things to do so I normally work 2-3 hours a day and coordinate/plan 4-5 extra hours (which i don’t consider work work).

You asked on how to handle things emotionally so I’m going to stick to that. First of all, I tell your from experience, do whatever you can to not dedicate more time to this than whats needed. Dont stop building your next business/idea. When I went through something like this therapy and exercise really helped me. This is a great lesson you have learned for the future. New and greater things will come in your future.