No: Minor anatomic variants of the arteries in the back part of the brain are no big deal. Sorry for misunderstanding -- I'm glad your FH / familial hypercholesterolemia was detected & can be managed. Without other findings, band and diplopia are unlikely to be serious ischemic disease, but are classic "functional". You're right to be concerned as such headaches, even if not "stroke", can disable.
Answered 11/27/2017
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