It seems you went many places in your astral journey put the on that stuck out to me the most was when you saw the "snake" your astral body could have been taken aboard a ship and ehtric beings could have been doing experiments on you and you passed the test. Maybe this entity has been given your physical life a lot of emotional stress and problems. By passing his test maybe you change a bad outcome in your real physical life that he would have made you look. Alot of times entities meet us in the astral plane because of past life ties we had with them.
the prt where you were smoking shrooms and you died might have been you higher self telling you a "possible future event; i say possible because it could simply change just because now you know it. The part with you mom and the cops could have been your subconscious
ultimately the message is all between you and your higher self ask what they meant and see what you "FEEL"