Short term: Take a break. Delegate. List the things that are painful/stressful and avoid on the days you're not feeling it. Limit email to twice a day. Don't use IRC/Chat if you can, it's too demanding on your attention. Take the vacation, leave the smartphone at home and let your mind rest.
Long term: Focus on moving to a point where you can take a step back. It's easy when you're a founder to become control-obsessed, which leads you feeling like you, and only you can fix XYZ. This is a precarious position to be in, and certainly isn't scalable. Think of this as the "what if I get hit by a bus" plan. All your efforts should be on proccesses, documenting and some key hires so that the company can run without you. Both for yours and the companies sake. After all, you need the option to retire/sell one day - the company MUST be able to run without you.