I had labyrinthitis about 4.5 years ago & had recurrent bouts - milder, more like an aftershock - for a good 2-3 years afterwards, normally when I was coming down with something viral. Over the weekend whilst in bed I've been having the sensation of the mattress falling away from under me (and clinging on for dear life) with nausea, the whirling sensation & nystagmus. However, its only happening when I lie on my right side. I'm OK on my back or left hand side. I'm more or less fine upright too, though I'm taking betahistine again to knock the nausea & mild balance disturbance in the head. Is it a mild recurrence of labyrinthitis or something else? I've never had it be so frankly one-sided before. If lying on my right is the problem, which ear is causing it? Woult trying the Epley Procedure at home help?