A few of us have had hearing loss with ES, but I’m not sure if a tympanometry test would be of use, I don’t know much about it, just had a quick read…I just had a straight forward hearing test.
The CT myelogram would be useful I’d think, it would be good if you could get a referral to a Neurologist to evaluate this. You could also see an Ophthalmologist to get your eyes checked, as the pressure can cause issues with the optic nerves.
Re the blood thinners, I’ve not taken them, I can’t find the discussion where the comments you mention are, but other suggestions are low dose aspirin, & @Isaiah_40_31 mentions a natural remedy in this discussion:
Possibilty of stroke - General - Living with Eagle
Sounds like your vagus nerve could be being affected too with the heart rate & BP issues…
Hope it goes okay with your ENT, let us know how you get on! 
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