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I used to have similar problem, due to my eustation tubes in my ears being different diameters. What I do now is on my way to the dive is start to clear my ears. Kind of like warming them up. I found this to help with vertigo/dizzy spells a lot. Also try to stay away from your dive buddies bubbles this I also found to cause some vertigo problems. As for the decent you should let enough air out to just start to sink and be able to control it. But keep in mind you should not have to have your bc fully inflated to stay on the surface. If that is the case you could be overweighted which is not helping under water as well.
It is perfectly reasonable to vent only enough air from the BC to get started downward; compression of the bladder will accelerate your descent as you go down, anyway. But if you can easily descend without letting very MUCH air out of your BC, you are probably overweighted.
A lot of people practice ascents, because we all know they have to be controlled to be safe. But many people never practice controlled DESCENTS, and they are important, too. Being able to keep your descent rate to one where you can comfortably manage your ears is important. So is matching your descent to your buddy's, so that the two of you don't get separated. Although there are some dives where a rapid descent is desirable or frankly necessary (hot drops in high current on specific targets, like wrecks) the majority of dives permit descending at a rate which is comfortable for the entire dive team. It's a good exercise to descend to ten feet and pause, to twenty feet and pause, etc., making eye contact with your buddy or even exchanging okay signals at each brief stop.
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Originally Posted by RonFrank
