Hi,
This looks like a problem with your WordPress theme. Enabling PHP error reporting shows the following error:
Code:
Fatal error: Call to undefined function cyberchimps_get_option() in /home/nibitx10/public_html/wp-content/themes/freshpro/header.php on line 78
You might want to try re-uploading/changing your theme.
To clarify, a DDoS attack would not cause this (and there have been no changes on the server).