I'm not a Doctor, so take this with a grain of salt.
Vertigo is, as I understand it, a visual thing. It is usually associated with looking down. Like when you look down from a tall building. It's the feeling that you are going to fall or are falling. Snorkelers in clear water sometimes get this feeling, and some divers do too.
But there is also the possibility that you are maybe getting an inner ear imbalance when you equalize.
So what you have to ask yourself is... do you feel like you are falling, or do you just feel dizzy? If you feel dizzy (or seasick) it could be an inner ear imbalance.
If you just feel like you are falling, looking away from the bottom for a while should clear the feeling. Look at your SPG and check air, depth, compass, to get your vision off of the bottom. Or just look at your buddy for a little while. Look up, and from side to side.
Vertigo can be overcome by practice and just getting used to the feeling.
An inner ear imbalance should be looked at by an ENT doctor (ear,nose,throat)... it's possible that you just need to equalize sooner and more often than you are to keep both ears at the same pressure.
Daly:
I grew up on boats and moving docs. I do not get seasick or carsick or airsick. Nver had a problem with carnival rides or any other sort of motion induced illness but I do suffer from vertigo during dives.
I am wondering if it is the "weightlessness" aspect.
Ginger will fix it or Dramamine II.
Anyone got any thoughts or ideas?
Anyone else have this problem?
Daly