Hey, I nominated MCU and I'd like to say, don't worry about it, it's okay, I personally don't mind at all.

I just checked my nominations, and everything's still there, it's just that for some reason all my MCU nominations are now listed under the fandom "MCU - Avengers Connected". A couple of them have been migrated to different tags, e.g. "Clint Barton (AC)" when I asked for "Clint Barton", but the rest are just listed as unreviewed.

Here's what my nominations page (formerly MCU) now looks like: http://i.imgur.com/vUZnSqD.png

I'm going to take a wild shot in the dark and suppose the same thing happened to others, too, so none of the nominations are actually lost, they're just listed under different Marvel fandoms (or Tolkien, for Silmarillion). So if you just mass-hit accept on all the Tolkien tags, and then ask someone to help you sort out which Tolkien character actually belongs in Silmarillion, everything should work out (: I don't mind helping if you need it!

For MCU, maybe all the tags ran over to MCU - AC. Then all you'll need to do is put them back in MCU.