Through this experience I’ve learned that many people experience vertigo in their lifetime. Typically it is short-lived or episodic.
As far as I can tell it is categorized into two primary origins:
Peripheral (vestibular or ear related) or
Central (Central Nervous System = brain, spine or even brain-to-ear). Occasionally vertigo can be involved in heart-related issues.
Peripheral vertigo is the most common origin, responsible for the vast majority of Vertigo cases. This includes BPPV or calcium crystals that break off in one of the fluid-filed canals in the ear causing episodic spinning or nausea for a few minutes at a time which is provoked by head movement. This type is often cured in 1 treatment (80% of cases) using body positioning maneuvers to relocate the crystal. A physiotherapist or physician with relevant training can usually do it. General Physicians see a lot of BPPV and other peripheral issues such as labyrinthitis, vestibular neuritis and Meniere's disease.
Central causes involving the CNS or central nervous system are rarer, unfamiliar/unrecognized and sometimes harder to spot. Signs can be mixed, subtle, untested, overlooked by physicians because the majority of cases are of peripheral origin. Mine was missed by many different physicians.
Additional reading on Etiologies and Evaluation:
www.ncbi.nlm.nih.gov/pmc/articles/PMC3096243/
http://www.aafp.org/afp/2006/0115/p244.html
http://www.nhs.uk/Conditions/Vertigo/Pages/Causes.aspx
Disclaimer: I am not a medical professional. I do not offer any kind of advice. These posts are my own general musings to cobble together my own limited understandings via random internet research and may be inaccurate, incorrect, or overly generalized.