DubWolf

Ouch yeah, most of the time none of these options account the possibility of getting hacked.

In cases like this, it's worth trying to file a support request and explain the situation to owners/staff.

Chances are, that they have logs of your account's activity, so they'd be able to see when the address was changed, and from what to what, maybe along with the IP address used to make that action (so if it was vastly different than usual, they'd see it could be not you doing this). If you'd send an email from address that was previously used for account, they'd be able to verify, that you is you that way, and revert attached email to the one you're contacting them from. They could also force password reset, that would be sent to your previous email, if their website isn't low budget.

If not, perhaps your IP address, that probably should be automatically attached to your request, may be helpful if they compare it to addresses from your account's activity. Unless you use VPN, which could make it harder.

Things happen, and unless the support sucks (which sadly isn't rare ), they should be able to help you.  At least here on the forums I'd be able to help if that happened to someone on the forums.

Oh yes. Unfortunately some of these giants have no easy way of contacting them and always just redirect you to some useless FAQ.

Still haven't gotten my facebook (which I guess, I don't care for too much anyways as it triggered me the last time) and more importantly, my steam account.

Yeah, I know something about this... Sometimes they don't even bother reading what you wrote, but just yeet some semi-automatic generic unhelpful reply, often asking questions to which the answers are literally there in the request you wrote. And to think they get paid for this. 

Ouch, they got your Steam too? D: That really sucks, I'd immediately be bothering support really hard if that happened to me.  Hopefully they'll be able to help you...