I am constantly dizzy whether sitting down, lying down, standing it doesn't matter now my tongue starting to feel numb what could it be?

Could be serious: You can't expect a diagnosis on HealthTap because HealthTap docs explicitly don't diagnose, treat or prescribe. But it COULD be a problem in your brainstem that is more than minor. Sorry, but you'll have to get a hands-on evaluation by a doctor for this. If I were you I would not procrastinate. The appropriate specialty would be neurology.