It's ok, if you have wp-content with everything in it, and your database still exists, you didn't lose anything.
Try downloading WordPress again and upload everything except the /wp-content/ directory with fresh copies from the download. Then, upload your copy of the /wp-content/ directory.
Once that's up, edit the wp-config.php file to point to the database.
Next, you may have to follow the guide at https://codex.wordpress.org/Changing_The_Site_URL#Changing_the_URL_directly_in_the_database to correct the siteurl and home values in the database.