I lost my entire YouTube account that I had for three years and got it replaced with a Google+ account. No favorites, likes are gone, playlists have been remove

I lost my entire YouTube account that I had for three years and got it replaced with a Google+ account. No favorites, likes are gone, playlists have been removed, and my videos are now on a separate channel that's linked to my Gmail. So when somebody searches my username, they won't be able to find anything. Seriously, Google, if you're going to make shitty changes to the second-largest website in the world, at the least make sure user data is preserved.