HELP!!! Raspberry Pi can't do Sudo commands. (sudo chown pi /etc -R and can't reverse as can't use sudo) HELP!!!?

So today I was setting up a mail server on my raspberry pi which is my webserver hosting many websites.

I was a total idiot and did sudo chown pi /etc -R (or what ever order it is) and now I have fakd my pi.

I can't do any sudo commands, when I do i get the error.

sudo: unable to stat /etc/sudoers: Permission denied

sudo: no valid sudoers sources found, quitting

sudo: unable to initialize policy plugin

During the boot up it runs apache2 but brings up loads of errors due to write issues so my sites work, just about however there are no error pages (404, 403 etc).

Also I can't access via FTP as vsftpd can't run.

Also I can't shut it down or reboot. as sudo reboot doesn't work and reboot on it's own brings up the error

-bash: reboot: command not found as guessed.

Also when I login via SSH (plugged in keyboard jams(can't stop key getting sent)) it says at the start of the line (I have no name!@webserver - $)(webserver is the pis name)

Any help would be much appreciated!

Many loves, jervi

check out my raspberry pi site @ http://pi.jervi.co.uk/ , if it works!