I had a bad dream last night so I was awake early. Naturally rolling left and right trying to gain a bit more sleep before dawn. When I rolled left the room was spinning around me so I stayed flat. I wondered if that was VBI again like I experienced January last year. When I turned flat again the spinning stopped almost momentarily which wasn't quite like last time.
I gave it another try after a while, i.e. roll left, it was like flipping a switch and the room started spinning instantly again.
The heart specialist doctor said this issue belongs to ear specialist.