I once smoked DMT while I had a cold. When I arrived to hyperspace, I found myself in an environment which looked like a hospital (a sparkly fractal hospital). There were entities who looked like nurses and doctors. They even gave me injections of something. After I received the injection, the rest of the trip is a total blank. I'm just suddenly back again. The next day my cold was completely gone.

Once there was a robot doctor that looked like someone from MST 3000, complete with the old fashioned reflector light headband thing, which dilated to expose a forehead penetrating corkscrew that opened up sirius-lee impacted sinuses.