In my infinite wisdom whilst only needing to update my wordpress theme via Filezilla, I really messed my website up. I went into Filazilla, highlighted every file on the right side (not just wordpress), right clicked and selected download. I did this because I misunderstood a tutorial video about backing up your website with Filezilla. When asked if I wanted to overwrite, etc. I just clicked overwrite file. By the time it was done my website wouldn't load at all. There is just a blank white screen.
Please, I would greatly appreciate any ideas on how I can get my website back up and running.