I must be honest here, I'm freaking out.
I can FTP in and see the plugin folders and files. When I did the upgrade through the dashboard, every single plug in had an error message saying something about a header I believe. Every plugin, even very popular ones are gone from the dashboard. I have a newsletter plugin that people have signed up for, inventory database, so it's not as easy as just "reinstalling" (oh I wish it was, I do). Since the folders are still there, I'm hoping it's something recoverable and just out of my realm of troubleshooting.
I am not well versed in WordPress, so it's difficult to troubleshoot for me. Any help at all would be appreciated GREATLY. SOS, MAYDAY