Many people have experienced and described exactly what you are experiencing. Someone smokes weed and then experiences symptoms of depersonalization. The symptoms are disruptive and frightening. In fact, it has become a common concern among those who write into “Ask The Therapist.”
The fact that this frightening experience continues to happen exemplifies the dangers of smoking marijuana. If marijuana were highly regulated and its ingredients were heavily controlled, then perhaps it might be safe. That is currently not the case. The majority of people who use marijuana get it from a drug dealer “on the street.” Any drug purchased in an uncontrolled setting has the potential to be dangerous and can cause permanent psychological or physical damage.
Over time, your symptoms of depersonalization will likely decrease but we can’t be certain. You may want to consider seeing a psychiatrist who might prescribe a medication to assist with your symptoms. You may only need a low dose of medication to decrease your symptoms. Even if you decide against taking medication, it may be advantageous to consult a psychiatrist about your symptoms. Psychiatrists specialize in neurobiology and biochemistry and may provide helpful insight about your feelings of depersonalization. Also consider consulting a psychotherapist. A therapist could teach you coping skills and relaxation techniques to help with your panic and anxiety attacks.
Be careful. I would strongly advise against using illicit substances. Drug use is dangerous and has the potential to cause permanent damage. Please take care.