Maybe need to clean your spice?  You could just have delicate lungs I guess... SWIM never has problems but friends smoking the same stuff say its harsh.  A tip: if you pre-burn the parsley before adding the spice, by puffing away in little puffs without inhaling, then there is a LOT less smoke to consume, and its accordingly easier on the lungs.  Ash/spice/ash is the sandwich of kings!

As for the uneasiness- SWIM was very wary of it when he first started, he was even worried that this forum was a crazy cult and that he was getting sucked into something dark!  But these fears were unfounded.  Now SWIM has no fear whatsoever of sub-breakthrough doses... in fact he never even does them because they're completely unsatisfying after hyperspace.  As for hyperspace... everyone gets nervous going in after time away, like anyone would getting onto the biggest rollercoaster in the universe.  But it seems to be only time that creates this fear- in nights when SWIM has gone more than once he's not nervous whatsoever on the second and subsequent trips.

Keep us informed!  I'd love to hear a full report of your first full-blown trip into hyperspace!