@davidchow very many different causes for vertigo, but there is one that I have much experience with. You have my compassion! Nasal spray to clear the tubes is a simple first try. But Always good to speak to doctors first ofcourse.
The one that causes my vertigo is BPPV. The funny thing is; the instant solution (even if temporary) is also diagnostic for this vertigo. It’s a series of movements, that bring me instant relief, and that way I know it’s that definitely. You need a second person to help though. Look up “the epley manouvre” Many YouTube tutorials. It’s got something to do with the crystals floating in the gel in your inner ear. Takes 5 minutes and honestly gives me instant relief. It’s worth a try and you can’t do damage with it.
@davidchow oh that’s good to hear👍🏼 hope you’re able to get to the bottom of the cause 😊