Years ago I did primal therapy, where we specialized in allowing the kind of emotional release you're talking about. The main things you need are a private, soundproof room and a qualified therapist to sit with you.

Thanks for the response. Not sure I'm currently somewhere private enough for screaming, but that does sound helpful. I've done 2 MDMA sessions supervised by my therapist where I had permission for outbursts, but I guess I wasn't quite ready yet (although it did help me immensely on the specific issues I was focused on at the time).