My daughter’s Ped Neuro thinks that her vertigo might be caused by Episodic Ataxia Type 2. This is a calcium channelopathy with vertigo as the main presenting symptom. Episodes of ataxia can also happen. My daughter had an episode as she was trying to take a class at the local Community College. Ended up in the ER and had to drop the class. The youngest daughter is on Acetazolamide 125 mg. It isn’t helping the vertigo yet and she can’t take a higher dose because it makes her dizzy and lightheaded, also sleepy. Seems to have lowered her blood pressure significantly also. Have an appointment with a geneticist in December.