Vestibular Migraine - Non Genetic?

It was recommended that I read the Survival Guide for Vestibular Migraines. It states that these are genetic migraines. I have a Traumatic Brain Injury - Moderate and Post Concussion Syndrome. I never had a migraine or vertigo until I was injured (assaulted in classroom).
Question: Could I still have a vestibular migraine without it being genetic in origin?

I have a VM diagnosis and have no family history of any form of migraine. So I think it is possible!