When you learn new things it's common for your performance to go down at first. It takes a while to incorporate new knowledge and ways of thinking into the way you play.
As for openings, whatever you pick, stick with it until you've learned it pretty well. Review your opening choices against a database and use an engine to find your biggest tactical mistakes. You can also post games on chess.com forums and ask for advice.
But alas, i feel confused now more than ever. Do you guys/gals ever try new things and come to find out later that its hard to find your way again? Whats a good approach to fix this?