How can i fix back my hacked website

Hello everybody,

Appreciate if someone can help me by restoring back my index.html as someone think that he is very smart hack my website.

I used to login to make any changes just by adding to my website at the end the "/admin/index.php"
if i will use this way, i am receiving the following message:
COULD NOT CONNECT TO THE DATABASE SERVER
- The server is currently offline or accomodate more users
- The server cannot accomodate more users

i access my website by adding /cpanel to my website, then i use the same password and user name to login and it accessed it.

I deleted his index.html, and keep mine, but even though his index appears danahotel.com/index.html

if enter danahotel.com, i found so many characters like this " . $rs['Text']; } } ?>

what steps can i follow to restore my website back.

Best Regards
Dana

 

Thank you for your kind reply,

Best regards
Dana