Couple possibilities: Increased intracranial pressure, either due to pseudotumor cerebri, systemic hypertension, with Valsalva exacerbations. Sounds like you may have scotoma, or - very unlikely - localized occipital cortex kindling. Are you on depakote for seizures or vascular migraine prophylaxis? Are you on HCTZ (hydrochlorothiazide) for high blood pressure or PTC? Consider stopping Ovcon - associated with bad cerebrovascular events.
Answered 9/13/2016
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