My web site dropped from Google search

[Vukosav Sredojevic]

Dear,

I have problem and I need help. I have web site www.prirodnikamenljig.rs  Who had an excellent ranking for keywords but  overnight dumped on 7 page google search  without notification why is it happened. Do you know where to turn for help and how fast to correct the error and restore the site where he was

Thanks in advance

Best regards