And again from the beginning.
Stop. You missed one thing. Celebrate the success. You’ve done it. It doesn’t have to be big prize or a great party. Meade Rubenstein advices in her post about solving problems: “At least have a cold beer once they’re resolved.” The same idea is brought by Lech when he talks about gratification: “Even the most teeny tiny success deserves celebration.”
With no celebration you’ll be more and more tired with getting just another challenging task instead of a bit of rest. Let yourself be happy for a moment with what you’ve just achieved. Show yourself it was worth the effort.
You’ll feel better.