nhessee on "MY WORDPRESS COLLAPSED AND WONT LET ME IN"

I have been working on my website I don't know what I did trying to get meta tag in for google, but now when ever I try to get back in it totally changed appearance of my website, it wont let me in as an administrator and and make changes. I had it perfect and now I don't know what I did but it says "cant display page: whenb I go to log in as administrator
HELP ASAP!!!!