My symptoms were numbness, tingling, buzzing and a burning sensation.
MS can't be diagnosed by blood tests; the blood tests are used to rule out other causes for symptoms (i.e. certain infections, low vitamin B levels, etc).
The diagnosis of MS is usually made with some combination of symptoms, clinical exam, MRI and spinal tap.
How did your doctor rule out an ear infection? A few years ago, I had a bout of nausea; not really dizziness, more like a seasick feeling. The doctor told me it was benign positional vertigo (BPV), probably caused by a virus. He prescribed some Antivert, and it cleared up own its own in a few days. Though, in retrospect, this may have been my first sign of MS. No real way of knowing.
What you're describing could be BPV or some other inner ear condition, like Meniere's disease.