Meniere's Disease Without Hearing Loss?

In Jan 2016 I experienced minor episodes of vertigo on a near daily basis, which I believed was remnant of motion sickness during a traumatic sea crossing! I noticed they continued weeks after and seemed to correlate with instances where I was feeling stressed. During this time I moved to the other side of the world and began a new job. I was previously living at 2800 m and spending my weekend’s alternating between the high Andes and the beach (involving lots of air travel). I am now living in the humidity at sea level and wonder if this could have provided sufficient trauma to initiate these attacks. 

After a night of moderate drinking I had my first and only severe episode of vertigo, which left me violently vomiting and unable to walk. After which, I experienced a month or so of very mild vertigo attacks, lasting 4-5 hours at a time. I felt unable to exercise and spent a lot more time at home. Throughout this time I always felt unbalanced and even a drop of alcohol would exaggerate symptoms. 

A hearing test came back fine, to my surprise, and I was treated for vestibular neurosis and given Betaserc for almost 3 months. I had no vertigo whilst on the medication but have had two or three minor episodes since coming off it (during yoga classes, playing football but also when lying in bed). The first specialist was happy the vestibular neurosis had been treated and any imbalance etc. was a product of my body overcompensating or lasting damage. I continued to turn to the extreme right when trying the Unterberg test. Now, my symptoms are fullness in my left ear, which occasionally proves painful and some mild tinnitus. The persistent fullness led my GP to refer me to another specialist, concerned it sounded like MD. Another hearing test and a pressure test both came back fine. I would suggest my hearing is more muffled but could this just be a sensation I notice because of the fullness? I am adamant my hearing suffered immediately after the vertigo attacks (before being treated) because I remember it being relatively distressing. I have been given Vinpocetine to try and hasten recovery of what the specialist believes is just a viral infection and to help with the tinnitus but I have seen no difference. I feel largely like I am not being taken seriously. It is coming up to 6 months now and I am desperate for some resolution or diagnosis that I can work with to try manage these symptoms. I am really active and travel a lot. If I should expect vertigo symptoms to return, I feel I would need to adjust or review my lifestyle as to not take unnecessary risks. Any one else in such situation? Or know anything about altitude and ear issues? Any advice or opinions are very much welcomed. Specifically, I was searching for information on whether it is possible to have MD but without suffering hearing loss? I am only 24 and so had wondered if my hearing could have been affected but remained within the so-called ‘normal’ range?