I used to have dizziness all the time...prior to any fusions.

The PM I had then explained that the cervical spine is so tightly congested with nerves (every nerve in your body passes through the neck), that they "crosstalk" to the auditory nerves. The auditory nerves in turn control your sense of balance, dizziness, etc. I can still get a little dizzy if the C2/C3 acts up but back then it was the C3/C4 causing most of it. Once I had that fused the dizziness stopped. It is just every now and then if I extend my neck that the C2/C3 will give me fits and dizziness. The lesser and greater occipital nerves arise out of the spinal cord and wrap in and out of the muscles in the scalp. So, yep, the dizziness is common. And taking the meds to combat the pain, etc., didn't help matters. They always made my dizziness much worse even when taking Meclizine to combat the dizziness.