Hi and welcome,
Could you please brake up your future posts into smaller blocks of text, people with MS commonly have visual and or cognitive issues that makes reading and following large blocks of text too difficult - ta :D
It's possible you were misdiagnosed with Meinere's disease, if you've not experienced the typical triad of symptoms but keep in mind that diagnosis of anything is based on not just your symptoms but your objective medical evidence.
Mental health conditions that include mania (eg bipolar) are not typically the cause of symptoms in only one side of the body, so i understand why your questioning mental health as the only explanation for these episodes.....it's possible the situation is reversed, your mental health situation is not the causation but is being worsened each time your dealing with physical symptoms, if you start to get more and more anxious about your health during the diagnostic investigation.
eg someone usually with a generally stable mental health condition eg anxiety/depression, can additional experience severe or escalating mh episodes throughout their life for their individual or unique triggers. If one trigger is their health, their anxiety will continue to escalate to extremely high levels of anxiety when experiencing symptoms and medically related testings, and it wouldn't be outside of expectations for the physiological medical issue to seem worse or get overlooked because of the psychological issues escalating.
You've been seeing a chiropractor and have also been referred to a spinal specialist, which makes me think you might actually have been diagnosed or are suspected of having a structural spinal issue(s) with peripheral nerve damage, nerve conductor tests and a spinal MRI definitely wouldn't be a waste of time now your older, after 20 yrs if it is a problem with your spine it should be more obvious, so please reconsider it could find your answer and make all the difference...
Hope that helps....JJ
Your story is very similar to mine. I posted a question a few minutes ago. Undiagnosed as well.