Yes, like everyone else says, take care of yourself.

I've had an experience like that myself. (My world wasn't doing barrel rolls, the floor was constantly tipping forward and to the left.) It went on for about a week, then I went to the doctor. Like yours, he said it must have been from a cold I didn't remember having, and that there was nothing he could really do about it. It went on about another week or two, and it hasn't happened again since.

So courage, hugs, and take care of yourself.