If gag yourself to induce vomiting and cancel the trip
You try to make yourself vomit up the mushrooms. Then you remember that right before you ate them you drank a pot of peppermint tea, and that peppermint settles the stomach and prevents vomiting. You are unable to throw up, and because of your fear, what would have been a nice pleasant evening watching pixies dance turns into an all-out panic fest. You run into the street screaming for a police officer to please come arrest you and take you to the hospital. You tear off your clothes and begin clawing at your eyeballs. A car full of drunks screeches to a halt and one guy says, "What the hell are you doing out in the street with no clothes on? What, are you on drugs?" And you reply "No shit, Sherlock. Heart attack much mushroom pain." Then a tapeworm crawls out of your anus and breathes flames of icy hot fire onto your head, which first melts your face, then cracks your skull. Finally, you fall over dead. Your spirit hangs around the scene for a little while, then gets bored. The ghost of you travels around the world, seeing many wonderful sights, but never being able to touch or experience anything. You spend a few years visiting the planets and exploring other galaxies, but ultimatley you find that nothing interests your discorporeal self anymore. You look for some kind of portal into another dimension, or the light that revived operating-room deaths always talk about. But you can't find any. You cry out in vain for God or Mom or anyone to end your misery, then you realize you are not a ghost. You are lying on the floor of your living room, tripping like Yog-Sothoth. However, the mere thought of that dread name summons the eldritch horrors from the between spaces, and they eat you body, mind and soul. You are abyssmized.
