Aureola on "Suddenly a lot of tables does not exist!! (In creating a multisite)"

Hello!
I'm about to install multisite following the Codex. So, I added the lines:

/* Multisite */
define( 'WP_ALLOW_MULTISITE', true );

to wp-config.php, just above */That's all folks.../*
Refreshed admin-panel and went on to Tools - Network Setup, Next: Then I'm asked to add these lines to config.php to the same place as above;

define('SUBDOMAIN_INSTALL', true);
define('DOMAIN_CURRENT_SITE', 'www.ct-equestrian.com');
define('PATH_CURRENT_SITE', '/');
define('SITE_ID_CURRENT_SITE', 1);
define('BLOG_ID_CURRENT_SITE', 1);

(Although I would like to install to a subfolder, not a subdomain, but I never got the choice)
Then this to the .htaccess:

# BEGIN WordPress
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]

# add a trailing slash to /wp-admin
RewriteRule ^wp-admin$ wp-admin/ [R=301,L]

RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ - [L]
RewriteRule ^(wp-(content|admin|includes).*) $1 [L]
RewriteRule ^(.*\.php)$ $1 [L]
RewriteRule . index.php [L]

# END WordPress

Now everything has crashed. I can't access mysite.com/wp-admin anymore, nor /wp-login. I just get a Database error. I try to run the repair, and it just says a lot of tables doesn't exist! An excerpt:

The wp_1_posts table is not okay. It is reporting the following error: Table 'ct_equestrian_c.wp_1_posts' doesn't exist. WordPress will attempt to repair this table…
Failed to repair the wp_1_posts table. Error: Table 'ct_equestrian_c.wp_1_posts' doesn't exist

The wp_1_comments table is not okay. It is reporting the following error: Table 'ct_equestrian_c.wp_1_comments' doesn't exist. WordPress will attempt to repair this table…
Failed to repair the wp_1_comments table. Error: Table 'ct_equestrian_c.wp_1_comments' doesn't exist

Anyone know how to get through this?! It is really urgent because I'm doing this on the live site (I practiced on localhost first and there everything worked like a charm) and it is very very down right now... Please help!