I certainly don’t want to downplay or trivialize your difficult experience, but from what you describe it sounds like you took a little too much and rode it out just fine. To take 5x, 10x, 20x too much is a whole different ball game, and I think that’s what some people are describing when they have these extremely bizarre, full blown panic attacks. Don’t get me wrong, I think that is great advice. Walk around, play in the garden, play the guitar (one of my own), if that is possible. Try to take an active role in something because that can definitely help keep those overwhelming thoughts from consuming you. In fact, that’s good advice for weed and other psychedelics as well, unless of course you actually want to writhe around on the floor and fully allow the experience to kick your ass. However, with some of these massive JWH overdoses, the person is 100% sure they are about to die, their heart is about to explode etc. In some cases (I experienced this), walking and talking is virtually impossible.
For severe JWH overdoses, you will likely be stuck in bed or a chair, at best maybe you can pace a few steps back and forth, but don’t go smashing through any walls or TV’s. For those situations, here is what I recommend, it’s basically a comedown exercise that has worked for me. Start with a question like what is the date?… this might be an extremely difficult question. If you don’t know, then ask yourself an easier question. What is the month? If you don’t know then ask an easier question, perhaps what is my address/phone number? If that’s too difficult then ask, what is my name? As soon as you’ve found a question you can answer, then ask a slightly harder one. If you don’t know the date, but you do know the month for example, then follow up with, “Well is it early June, or late June?” Even if you don’t know your name, I believe you will eventually find a question you can answer, and all the while you are gradually coming down. Before long you might even know the date. Just work hard to stick to these simple threads, and it will be sort of like going for a walk, or playing in a garden inside your head, when perhaps you can’t physically go for a walk.
This method has helped me, both with jwh-018 and other heavy psychedelic experiences. Hopefully, it won’t backfire on somebody, where they realize they don’t even know their own name and that causes them to panic more. That has never happened to me because when I’m so far gone that I need to use this exercise, more panic would be impossible.