I'm sorry to hear that, it does sound like someone has hacked you.

Double check the spelling of your email and password.

Contact STS support asap with details of what has occurred. I know they will be able to help you.

Once you receive a ticket number from them you can pm a dev on forums and inquire about your case. Keep in mind STS help is inundated with thousands of emails per day. Only make one request and be patient, they will respond, multiple requests will have the opposite effect and put you at the bottom of the list.

Hoping you will get your account soon.