Without the URL of the blog, we can’t even tell for certain if you’re in the right forum, but from the sounds of it you’re not. If you have multiple email accounts hosted on the blog, it’s probably not hosted by WordPress.COM, is it? In that case, you’ll need to look at WordPress.ORG for assistance, as our blogs work differently here.
Oh, hang on, now I get it. Yes, you’re screwed until staff comes back on the 16th to help you, unless you can remember or find the username/password. I’ll flag this thread for staff attention, but who knows if they will pop in?