Mine is almost certainly a form of ETD. I never get total fullness, but there’s definitely a pressure in there and periodically a squishy fluid like sensation.
It’s very possible that migraine can also swell the ET and lead to the same symptoms.
I definitely got migraine nearly 12 months after my first ET symptoms, so for me the causation is the other way around, but will not dispute it could work the other way.
Perhaps MAV creates a vicious cycle - once you get ET disturbance you get additional allostatic brain load which puts you more at risk of migraine which itself can puff the ET … and so forth.
I’ve always known it did not start with Migraine for me, and it’s been hard to defend that position at times in debates.
I could never understand why I had almost exactly the same set of symptoms as someone diagnosed with VM yet my condition began with trauma.
Now I’m much more clear what is likely to be going on and why there is such similarity.