Why do you work so much? Do you need the money? Are you too timid to say no? Are you looking for a promotion? Do you love the game?
On top of all that work, why do you spend even more time on open source projects? Do you still have something to prove? Is this a source of entertainment or anxiety?
The fact is, you're extremely talented and could create almost any work arrangement you fancy. There's no need to quit IT and become a bus driver.
But again, what you should do now depends entirely on why you're currently working so much.
For what it's worth, I've been there before. I almost sold everything and moved to Costa Rica. Instead, I sold everything and made less radical changes.
One of the reasons I worked so much was because everything I owned had monthly payments. Selling everything solved that. Once you don't need to make a lot of money to pay your bills the world opens up for you.
Suddenly you can walk into your boss's office and say, "look, this is how it's going to be...". If she says no, then you walk. I really can't express enough the difference not needing money makes. Most people are desperate for money and it shows. The confidence you get from not needing a paycheck for the next year shows even louder because it's so unusual.
Now, I typically do consulting work 4 days per week and work on my start-up at nights and on Fridays. On the weekend I hang out with friends, surf, snow board, skate, and sometimes do more work (if nothing else is available). I also take a ridiculous amount of vacations, some just a few days and some for a week, but typically about every 3 months. That's what keeps me going.