I was laying on my stomach and when i turned over into my back i felt a popping sound in the base of my head/skull. i've since been dizzy and nauseou.

OA / AA Subluxation : Similar serendipitous observation was made by inventors of the field of chiropractic. Subluxation at the occipo-atlantial joint, the atlanto axial joint or c2-3 has been reported to cause these symptoms. These may also be signs and symptoms of less commonly known strokes. A physician evaluation is needed. If medically cleared, can consider chiropractic or osteopathic manipulative therapy.