my son, 16 years old, took magic mushroom (not sure of the dosage) about a month ago. He came home that day in a panicked state, struggling to control his emotions. I tried to comfort and relax him while in this state, after he told me what he took. Since then, he has been experiencing panic attacks at least once per week, which included a very rapid heart beat, having trouble breathing and scewed sence of reality. I have been reading up on the topic, and I am not sure whether its flashbacks that he is experiencing or coming down from it. i do not think he had anything to eat on that day, and this was his first and only experience with any drug. how long does the effect of the mushroom last, if you had only taken it once? Do I need to seek medical help?