That's the worst feeling. I hope you can recover it and get on a password manager. I believe in you!
I wonder if you could email some of the social teams if you haven't already. They may have a way of getting you in. It's common for someone who hacks you to change your password. I imagine they could use the same solution here since you know when you changed it. I don't know how you can prove your identity, though. I wish you the best of luck.
WMIK
Damm that sucks ass. the bad kind.