[congerous]

I've been there. A ton of good advice is on this thread. You need to try to influence your internal state chemically if you want to stay on track. Exercise, medication, meditation, eating and sleeping healthy are all helpful. It's also good to reconnect with people that matter to you: family, friends, etc. If you're closing the deal, and the money is significant, just think what you could do for them, or for other people who need help. And find ways to spend more time with them, because our lives are defined by our relationships. You could say your self exists to the extent that your in conversation with people who understand you. So go find with and be with them. It'll help you refuel.