I’d say it was the “reflux”, the retrograde flow.
Here is “part 2” of my story, circa March to May. There’s also a link back to the beginning.
http://www.avmsurvivors.org/t/my-update-dural-avf-embolization/16916
The other thing I would say is that everyone’s AVM affects them in ways driven specifically by what connections their AVM has made. There may be some common or generic things about a right occipital DAVF like having pulsatile tinnitus and dizziness but how a DAVF progresses, if it does, may be very specific to each person. I’ve only my own experience to go by, so don’t put too great a store by one person’s experience.
I’ve not read of anyone else who ended up with inflated draining veins extracranially, for example. Surely to do with my own locality of AVM connections and perhaps the narrowing of my transverse sinus.
Very best wishes,
Richard