Wasn't there myself but a mate of mine did one of the overnight tours there a few years back and said the fourth floor absolutely destroyed him, came home looking like he hadn't slept in a week. He's not the dramatic type either which made it worse somehow.
What did you actually experience? Because I've heard so many different accounts from that place - some people get nothing, others get completely overwhelmed. The spirit box sessions I've seen recorded from Waverly are some of the most compelling I've come across, there's a consistency to the responses that you don't usually see.
Would love to hear what happened to you specifically. Was it more of a physical thing, like pressure or temperature, or did you pick up audio?