Immediately test your web site to make sure it is working. Load up your web browser and surf your own site. Click on anything you can and make sure everything is working just the way you would expect it to work. Are all the pages loading properly? Are all the images appearing?
NOTE: If too many things fail to work during your initial testing, quickly remove or comment out the new lines in your .htaccess file and reupload it to your site. This is how you turn off countrycheck.php. You can safely leave all the files in your "country1" and "country2" directories while you are figuring out what's wrong. All the control is done with the .htaccess file. In most cases, you will probably not see anything wrong if your site is composed of well written code.
Clear your browser's cache so that you aren't being fooled with the browser displaying previously cached pages and images. Go test your web site again. If you are running special things like forums and chat rooms or anything else, go and do some stuff there and make sure it is all working.