My Website Login Data Deleted ?

I have a huge problem with my website most likely something i have done out of my own stupidity, i have lost the ability to log into my website all administrator accounts have vanished. i had edited one of the options in some settings, i changed my Domain name from how it was being displayed (http://yugioh-episodes.com) to (http://www.yugioh-episodes.com)as it looks better, at this moment i was logged out and my blog does not have any admin accounts, is their a way i can get my blog back i don’t want to loose the many many hours of work i have put into this …. please help me . thanks