"The story of one man is the store of the entire world".
I think it's easy to talk down to someone who has admitted failure, but the truth is we've all been through it, although some of us hide it better than others.
My custom web-development business tanked last year after customers refused to stop asking for changes. Insomnia & anxiety were frustratingly close friends of mine too.
Maybe the site is shutting down and maybe you could have done something different that would have succeeded more, but super-kudos for trying!