Used "Synch" instead of a transfer ont PC; imovie now missing video clips

I made several movies using imovie on the ipadmini. The imovies use both still photos AND mini videos taken with either the iphone or the ipad mini.

I wanted to put the finished imovies on my pc to optimize playback with quicktime. Mistakenly, instead of transferring photos/movies from ipad mini onto PC, I connected with Itunes on my PC, and chose the Sync option. Aaaargh. It put a bunch of photos onto the Ipad mini I had taken OFF, prior to making the movies. Then, the worst part is, the completed imovie videos on the Ipad mini, are MISSING the video clips in the imovie. It's like they disapperaed when I did the Sync.

Where are the missing video clips? On my computer? On I cloud??? How do I find out? In the best case scenario, I would like to "find" the stuff that got "lost" when I synched the folder on the computer to the ipad mini, and have my IMovies restored to how they were before.

Please help!