Please, need advice. Can no longer login to C5 site admin console

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I created 31 new pages for my site today. I also created 32 new file sets, because each page contains a photo gallery that shows the images from a different file set. All the pages were built and tested just fine. But then I went into the file manager and checked off a bunch of file sets. I was in a hurry and not thinking. C5 started spinning and spinning trying to return the files in the sets I picked. It never returned a result. I closed the window and tried to log back in. I discovered I could no longer log back in. After entering my id and password, C5 just spins and spins. What is worse, my website page that make use of the file sets I checked off are no longer loading for site visitors. What have I done? I feel like I need to reboot this thing, but I don't know what that means when the app runs on a web server.

wolfwerk