Hey! Nice to meet you.

you don't need a referral to a doctor for a good vestibular assessment.
*edit*. from experience, a certified physiotherapist or occupational therapist will take 45-90 min just on your physical exam. a doc doesn't have that kind of time.

perilymph fistula isn't that common...I would go after a vestibular dissonance first...but a vestibular therapist can help you with a differential diagnosis.