I don't see why you think it might be caused by vaping 3 months in? 3 days, maybe.... Did you change anything recently? In any case, I'm not sure if vaping would exacerbate your condition or not, but if you get a bit nic-fitty, I'd actually suggest nicotine GUM, as chewing it might help your ears, that's a fairly common remedy for clogged ears and when on airplanes so it certainly wouldn't hurt you any, in the short term.
Anna
Now that u mention it, I did increase my nic from .3 to .6. when. I was on .3 I don't remember having any discomfort or ringing in my ears. Ringing has dropped a lot in volume after stopping for about 2 weeks, but still hasn't gone away completely. So it's hard to say wether vaping caused it or not. Also, when I first started , I can say I over did it a bit. I was vaping all day, everyday basically. Had to refill tank sometimes twice a day.