Dizziness & Vertigo Support Group
Dizziness is the sensation of instability. Vertigo refers to dizziness with a sensation of motion. Vertigo is more likely than other types of dizziness to be associated with nausea, vomiting, or double vision, to occur even when lying down, and to feel better with the eyes closed. If you are a frequent sufferer of dizziness or vertigo, join the group and find support.
Have you seen a doctor? If so, what did he/she say?
When did it start?
Is it constant or does it come and go?
Sounds like some form of vertigo.
There are some common causes and many more causes that are not common. I don't think anyone here will be able to tell you what the cause is, but may be able to help you figure it out, or at least listen to your problem with a sympathy and understanding.