That sounds horrible. I can only echo the advice given here. Carve out time for yourself, exercise, and balance your life. A balanced life is the key to avoiding burnout (this after 25 years of specializing in tiger teams and rapid prototyping).

Also, there is a startup opportunity here for someone. A specialty of concierge medicine around concierge psychology for startup founders, CTOs, and CEOs. Not sure whether it would be profitable, but given that it would likely save company productivity and in some cases make the difference between failing or not, I'd think it would be very profitable. I do not have the chops or desire to execute on it though. Feel free to use the idea if you want to run with it. If you do and want to compensate me then remember that nine nines (99.9999999%) of success is execution, not the idea. If you succeed, and still want to compensate me, and I'm at the point where I can use it, then give me attribution and free access to the service for life and we'll be 100% good.