I remember reading at some point that there is a difference between swooshes and zaps, but don't recall seeing the description of how they differ.
When I was first in withdrawals (in April), I experienced a sudden swoosh sensation in my head when I moved my head or eyes. Most of my life I have had these same head swoosh feelings when I'm having a change in hormones (usually PMS related), and I've also experienced this when I get a fever. No idea why.
While what I've experienced is a "swoosh," it also could be described as having a "zap"-like quality.
So could anyone enlighten me as to how a zap differs from a swoosh, if it does?