G'day Dave,
double post, i know, but better safe than not. Shell put some info about busting- different to mushies but apparently just as effective and less potential for getting in trouble.
Do as much research as you can to make sure you understand the product first though eh? With some of those type of things if your minds not in a good place to start with, it's only going to get worse. And that's without the headaches.
I have no experience with any of them, but I would if I could. I firmly believe there's a natural cure for every ailment, it's just we don't know about it yet, or we're not allowed to use it. Go well mate.
cheers peter.