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Watching the bubbles seems like the most practical thing to me. You may or may not have a wall or a buddy close by but bubbles are ever present. By whatever accident of birth I’m not affected by vertigo regardless of the vis. I feel for but can’t really relate.
I just want to make one mention that bubbles (in a current) may not necessarily go up. Luckily the gauge will tell you without a doubt! I've never personally experienced vertigo but I can imagine that it's a terrible thing. Hopefully the rest of the advice in this thread helps!
Disorientation and vertigo happen in both day and night diving. An SMB is a good way to get your bearings, but if unplanned it might indicate an emergency to the surface crew. Using a rope to descend, and staying near the bottom or a wall while using a bright beam is helpful. If there is a strong surge, advise you cancel the dive.
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