If you have had ringing in your ears your whole life, you weren't a smoker before vaping, stopping or vaping 0 nic (although in SOME ways, I could see the act of inhalation itself being kind of a trigger, so maybe do as your doc suggests and stop for a few days.) If it's allergy/sinus related I could see one flavor in particular being a problem.
BUT, given your condition PREDATED the vaping, while vaping MAY exacerbate it you really SHOULD see an ENT and get yourself diagnosed. Menier's disease runs in my husband's family, but it is treatable, you won't lose your hearing but what does become debilitating is the dizziness, the falls, etc. But the good news is there IS treatment now (better than before) and it may not be Menier's at all, it could be something totally unrelated and something environmental that may or may not include vaping.
Good luck, I think you really need the correct diagnosis and whatnot.
Anna