You don't need links. Just exhaust yourself. You know how.

I was in the same boat - solo founder, working 14 hour days, incredibly stressed. Exercise and avoiding alcohol, drugs, and shitty food is the key.

There is a certain level of stress that I think can't be dealt with. When you reach that limit, you have either step back and curtail what you're trying to do, or just push forward and get through it.