Psychedelics are a consciousness expanding technology; if you feel unequipped to make progress with them then you should trust your intuition and step away for a period of time.
If it's because you felt the fear and the fear was too great then I would say go deeper if your sanity permits because it may be past the hardest point that you find something worth bringing back.
You're a psychonaut after all, you are one of the select few humans on this earth right now that is studying the inner landscapes of psychedelics with conscious intention and awareness.
You're familiar with the Psychonautwiki I presume?
