Sam did the right thing there. PTSD sounds reasonable and would fit the symptoms. Western meds can be evil that's for sure. They mask or remove the symptoms of an illness but don't cure the cause. Zoloft is an SSRI, so I would think it's to help with anxiety.

Staying of drugs, especially the weed sounds very reasonable to me as it may potentiate the negatives.

As with dealing with the experience, so much happening so fast, maybe you forget about aspects over time. And maybe if you stay of the weed and manage the anxiety, you could treat it like a bad dream.

Because maybe after all, that is just what it was, a bad dream ? (You could tell that to yourself because after all, nobody knows)

With ego-death I meant just in the experience where you get to a point when something smashes you and you become something else or nothing or everything

This is very well said and would mean for Sam to integrate the experience which would cure the cause of the symptoms.

Maybe Sam could use his dreams to confront the entities from the experience and make sense of it.