I'm sure that Mayo was SOOOO excited that someone with a few years of personal training experience (and very limited if any medical/physiology knowledge) knows so much more than their teams of top-of-their-field specialists with decades worth of education and real world experience.
You say you take the same courses as Doctors and Nurses ... I find this VERY interesting because (having 4 personal trainers, who also happen to be Physical Therapists and Rehab Therapists, one of whom is also a nurse) anything more than a very basic "intro" to anatomy and physiology isn't part of a Personal Trainer course/certifications. Even a full year of full time university anatomy and physiology classes wouldn't give you an 1/8th (literally) the education of a doctor - or a 1/10th of an ENT.
Being a professional and specialist in my own field for 20 years now, I see this type of situation all too often.
People who take some courses and have worked in a field for a few years is they think they know everything. That they have these brilliant ideas and "fixes" for things. They think they know more than the people who've been working and studying in the field for decades. You don't. You're limited time in the field and very limited experience (if you've had less than 1000-2000 regular, ongoing clients, you're "new")
You say you've "cured" people of their inner ear disorders, but have you seen their full medical file, read their MRI and CT results? Do you actually KNOW what their complete (correctly Dx'd) inner ear issues are? Or are you basing your "success" on a few (less than 100people) where they're said they "have inner ear issues" and then you've suggest core strength and stability exercises to "cure" them... because if this is the case chances are while they might have some inner ear issues, their primary balance problems are actaully (the typical) core issues most people have.
Inner ear disorders have a VERY specific set of issues - which have to do with things that exercises can't fix because the don't have a neuro-muscular component.
Core strength and balance exercises will help basically anyone - and thus an improvement will be seen, however for those with TRUE inner ear balance disorders/diseases the underlying condition remains the same and thus that part of the balance remains affected.