As totally cheezy as it sounds, I "gradually woke up one morning" and realized what it was that I wanted to accomplish with my life. My newfound goal was going to require more resources than I could ever accumulate by selling backpacking gear, so at that moment I decided it was time to get back into the tech industry. (I still have fond memories of my time away from it though.)
I haven't felt anything close to the same burnout since. Although I'm often stressed out over one thing or another, for the most part I'm pretty happy with the way everything is now.
I think that i am fortunate in that I direct all my wrath and loathing outward.