Account has been hacked!

My account has been hacked! The hackers is attempting I change my security info. I tried I cancel the request but it's requesting for a code that can only be emailed to the hackers account! It said it won't take effect by September 17. I know it wasn't a virus. The hacker is from the university I attend. The hacker hacked my facebook account and that's how I found out. Facebook sends me notifications of logins from unrecognized browsers and devices. When I checked the IP address, it was located at the university. Yes, I've logged in using the school computer but i always clear the history and log out. So far I closed my hotmail account and changed my password. It's killing me that my own hacker is just right there. Please help!