What is a spinning sensation in your head mean?

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You know like when you were a kid and you would ride on a merry-go-round or spin yourself round and round. And then you'd be falling down dizzy; you're head would be swimming. Maybe a week or so ago (or longer) I started having this same spinning, or head swimming sensation, when lifting my head up or moving my head while in bed. It feels as if I'm about to pass out; it feels different then just being about ready to fall asleep. I read online that it is associated with migraines. I also have been feeling sort of light headed throughout the day. I went to a follow up visit with my doctor last week and I told her about this. And she said she didn't know why and it might be a side effect of medication. She said hardly anything to me. And my ultrasound I took after having to go in am ambulance to the emergency room (in the past month) showed I had gallstones. She told me there was nothing to be done about my gallstones. Anyways anybody know about these things? Thanks.