Had a similar problem but it was low blood pressure standing up.
It’s called SYNCOPE...similar to what happens when you suddenly stand up after sitting for a length of time (orthostatic hypotension)
After a lot of tests the cardiologist confirmed it with the “tilt-table” tests and it’s now treated with Florinef.. The generic is fludrocortizone. It helps the body regulate salt, fluids and blood pressure.
Need a Walker to get around.... anything to avoid a fall!
I’ll leave the motorized chairs to the fat ladies at Walmart.
The topiramate cured the vestibular balance symptom of my migraine but did not totally cure my migraine
My migraine is triggered by my rare type of orthostatic intolerance which has been verified on two tilt-table tests as being neutrally mediated syncope...but of a variant that is hypertensive, NOT hypotensive.
In other words, during the two tilt-table tests that I underwent, my blood pressure steadily ROSE after the table was tilted up until the medical criteria was reached for orthostatic hypertension...before the blood pressure fell sharply and syncope occurred.
As it stands now every time I stand or walk for more than 15 minutes it will trigger a migraine aura followed by a migraine. The migraine with topiramate is much milder now cognitively and has no vestibular debilitation.