Is the entire site gone? Or has it reverted to default settings? Do you at least get a login window? Or is everything just a white screen?
If you get white screen everyhere: log in to your server using FTP, navigate to the folder /wp-content/plugins and rename the WooCommerce directory to something like woocommerce-disabled.
This should automatically disable WooCommerce and possibly get your site back up. If not, do it with other plugins as well until the site is back up.