I've finally just had to completely clear out my entire history and put it on pause right now, because every single fricken thing that I watch keeps piling up in there, and they keep reappearing in the playlist, even after they've been removed individually... and knowing YT, it'll take forever to fix this goof.
Also, seriously, something about keywords does NOT work anymore: I did a search of most of the keywords I put in my latest upload, filtering each results by upload date, and it's not appearing in the results under any of the keywords that I've used.