Ask HN: What do you do when you're depressed for a day?

I'm a founder of a funded company. We have plenty of runway left, will probably be able to raise another round, etc. Have a small team of really talented people.

But the past couple of days I've been completely down in the dumps. Like... barely able to get out of bed and function. A lot of it comes from my frustrations with the product that I keep playing over and over in my mind - I'm not sure how we're going to "win." It makes me want to crawl into a hole and die.

But I know I can't do that. I have to go talk to users and our employees and pretend like nothing is wrong (maybe nothing is?) I mean we have a long way to go, but we're on the right course.

I just don't know what to do on days like today. I don't know how to keep going.