Pretty much all of the symptoms that you've reported can be experienced as part of a headache disorder. With your dizziness and visual problems some here might speculate that you may be experiencing headache-free migraines and that could be true. But considering the multiple diagnoses of inner ear problems and the little head pain that you've experienced I do not see any reason to think that this would be linked to any sort of headache disorder.
Since there seems to be a consensus that the problem is centralized in the inner ear I'd say your best bet is to sit down and talk with your otolaryngologist and ask for some clarification and advice. Most likely your specialist will be able to address your concerns much more helpfully than any of us. That's not to say that I don't hope that someone here has some insight to share. If your ENT can't answer your questions to your satisfaction then maybe you should try getting an evaluation with a different doctor at a different practice.
I wish you the best of luck. Unfortunately this is outside the scope of my experience. But Sweden does make a good point: most medical problems (and especially neurological or vestibular ones) can be exacerbated by stress. Because the inner ear is such a fragile system, physical strain could certainly be adversely affecting your condition. Make sure to discuss your vigorous exercise routine with your doctor.
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