My site settings have went nuts.

Hey guys. I went into my "Site Administration", and changed the contents of the box next to "The site URL, followed by a trailing slash:" - It originally was "http://www.mysite.com". I did some experimenting (due to token mismatch issues) and switched it to "mysite.com", "www.mysite.com" and simply "http://mysite.com" ... But now it is stuck on "www.mysite.com" and it won't add the "http:" and now my css won't work. When I look at the url after hitting "save" - It takes me to this ....http://www.mysite.com/pg/admin/site/www.mysite.com/action/admin/site/www.mysite.com/action/admin/site/www.mysite.com/action/admin/site/www.mysite.com/action/admin/site/www.mysite.com/action/admin/site/www.mysite.com/action/admin/site/update_basic

Does anyone know why it loops like this? and does anyone know how I can fix it? I am thinking it is probably something wrong in the database, as up until this point the code itself was working just fine. Any help would be much appreciated!