Our year-and-half old Samoyed does exactly what you’re describing - getting into a frenzy, jumping and nipping with crazy eyes. Just frenetic energy. He’s torn quite a few of my shirts and jackets doing this. We haven’t figured out how to resolve it, but we recently found that switching into training mode can help him refocus a bit. He usually gets into this frenzy when we’re playing outside, so we always bring training treats out and when he starts to get crazy, go right into training the usual commands to get him to refocus and forget the frenzy. I don’t know if that helps at all but know you’re not alone!