I wanted to add that my other half had similar symptopms a few years back. He had a CT scan etc and nothing there - we thought maybe BPPV and tried dix-hallpike. In the end the doctors could only assume he'd had a virus which had affected his inner ear and that he'd be back to normal within a month. However it was 6-9 weeks until he made a complete recovery - so if they rule everything out, don't expect a recovery timeframe to be precise, don't panic if it passes and you're still not better, it took him twice as long. Good luck