I find it helps to remember that if I don't do the boring stuff my company is going to fail, I'll be working for someone else again and the only reason for fail

I find it helps to remember that if I don't do the boring stuff my company is going to fail, I'll be working for someone else again and the only reason for failure will be that I was too bored to do the work that was essential for success (which is a really lame excuse). If you can't focus today, get outside for a bit and stretch your legs. Watch the pretty people in the park. Get a coffee, sit on a sunny patio and revel in the fact that you're an entrepreneur driving your own destiny and can take a goddamn afternoon off if you need it. Then, when you're recharged, return to your office and get back to it, because that work isn't going to finish itself.