Hi Netti and welcome to the Forum!
So sorry you are having some symptoms and i hope you find the answers you need.
My sister went to an ENT with similar symptoms and then was referred directly for the MRI, which she had in a matter of weeks!
Me - i went to two different local docs over a series of 12+ years and they were clueless about my partial hearing loss, never suggested any other testing!
[And i was about 40 years old at the time - they told me i was just getting 'older!' ]
I don't know anything about the ECOG test, so can't help you there.
But i can tell you that i had to go to a major medical center, go thru a hearing test - and again, the doc said the test was inconclusive.
I ASKED him to write the script for the MRI and the rest, as they say, is history.
IMO, i would want to 'rule out' the AN and go from there, but that is just me.
My thoughts and prayers are with you as you make the decisions for these tests and find out the results.
Please keep us posted as you make your way on this journey.
Sincerely,
Sue