There's no "Institute of Shamanism" that declares who is or isn't one. Mainly, if you have alot of knowledge and experiences about the mind, life and the universe (does not necessarily even have to involve drugs at all), AND YOU HELP OTHERS EXPLORE AND UNDERSTAND these things... you are a shaman.
So far as clue.dup's experience: the parts that felt shamanistic, those feelings and impressions were entirely generated inside your own mind; the outside world and especiallly the 2 party dudes probably had nothing to do with it and probably not a clue as to what was going on. As to your guardian angel, also generated inside your own awareness, but nonetheless may well have important information and advice you might not otherwise access. Same with the fairy thingy... I think they do exist in some boundary layer between the imagination and "reality" (whatever the fuck that is), so I'd say that observation was also "real".
Schizophrenic? Could be... but being on IM Ketamine plus 4-aco-dmt, well, anything can happen really. I'd take the advice to SEVERELY scale back the drugs... life is not a competition as to who can get the highest, dude. Such wantonly excessive behavior is immature and, frankly, stupid.