Unfortunately, way too many people who use psychedelics are both unprepared for the experience and don't know how to use them constructively. Many, if not most

Unfortunately, way too many people who use psychedelics are both unprepared for the experience and don't know how to use them constructively. Many, if not most people go through their lives mostly unconsciously, with very little introspection or understanding of their subconscious. Many of them have serious issues and demons from their childhood or other trauma that they've never dealt with and do everything within their power to avoid thinking about. Is it really a surprise that when they take a substance which has the effect of powerfully bringing subconscious content to consciousness, a substance they've never been taught how to use properly, that some of them are unable to deal with and are frightened of what they find? Too many people take psychedelics with little clue as to what to expect, or with intention to just "party" or "see some trippy colors", not realizing just how powerful these substances are, and not realizing that they should be treated with respect and prepared for properly (we could say a lot about set and setting here). Furthermore, psychedelic users rarely know what to do with or how to integrate what they learn after the experience is over. This lack of integration and refusal to deal with negative as well as positive emotions and subconscious content can also cause many problems. This is why psychedelic use is best done under the guidance of experienced therapists or in a shamanic context where the tripper can get help both during and after the trip. I'm not saying that doing or not doing any of the above is what led to the bad trip you experienced, or to the anxiety attacks afterwards. I don't know you or anything about how you approached the experience to hazard a guess. However, it would not surprise me if some of these issues were at play here.