I don't know if they ever go away, but i have them, and yes, it's PTSD. That was a surprise to me to find out, too -- I always thought PTSD was a full-on flashback, but many T's now have told me it doesn't necessarily have to be, and that "snapshots" count.
If you figure out how to make them go away, let me know.

Mine happen at the most inconvenient times!
TC
Candy