Correct me if I'm wrong, but you should be fine? Benzo's, from everything I've read, have had no horrible interferance with MDMA. Although I am not certain with the amount you took. I know you can take xanex if you are freaking out during a roll, so I'd assume it wouldn't kill you to have it in your system before you roll. As for the muscle relaxor, I have no idea to be honest. Just be safe, and good luck, and remember I am not 100percent sure on everything I said so don't take my word for it 100%.