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He is showing symptoms of anxiety, restlessness
, emotional turmoil, crying spells. He is smoking pot for two years. These features are common in some susceptible individuals who smoke pot. Also as you have mentioned that he felt he would die, or he felt that those around him are in danger. He is showing bizarre behaviors. He is also suicidal. These are psychotic features seen with pot or cannabis. If not stopped at this state he may land up in some psychotic disorder
. I will advise you to take him to a good psychiatrist
for treatment of anxiety. Motivate him to stop taking cannabis. For immediate relaxation medicines like Etizolam
etc can be used in consultation of psychiatrist.
Dr. Seikhoo Bishnoi