of course rumor has it he would take DMT via IV for 8 + hours several times a week. I can only imagine what that would do to someone's mind (hint it wouldn't be pretty)
a few years ago i read the account of what went down with the kidnapping, Truly horrible stuff there, highlights include ball stomping, injecting him with an unknown substance which still affects him (likely a parasite) and leaving him for dead in the middle of the desert.
For some reason I can't find it, which is likely for the better
http://www.salon.com/2011/09/28/the_new_lsd_cure/
Probably the best general article I've read on the subject in recent times; it's also very hopeful.