Need serious help

I know this is probably going to get deleted, but maybe someone has some idea they can send me before that happens.

I cannot find a Reddit for Steam itself (the one that is for Steampowered seems to be about model steam stuff), and I can't find an email address for the site.
Yesterday, I got three emails in a row; the first one was an attempted account recovery from Indiana (I'm nowhere near Indiana), the second was that my password changed, the third was that my e-mail changed... none of which I did.

So, I'm locked out totally. I tried to follow the Help thing, except that I don't have the Steam Authenticator app, don't remember what phone number I had setup (and that generates an error message anyways)... and my account name isn't working, my email isn't working, can't do anything, and there doesn't seem to be a way to support a support ticket.

Does anyone have any tips, or is my account and everything in it gone?