Hi,
How are you? Are there other symptoms present? If there is no history of trauma to the head or neck, this could indeed be due to primary headaches such as migraine. Migraine usually presents with one-sided throbbing headaches associated with nausea, vomiting, sensitivity to light and sound. Rest, ice pack, and pain medications prescribed by your doctor may help provide relief. Avoidance of triggers may also prevent recurrences. A headache journal or the migraine tracker in this forum may help. If it persists, check with your doctor or be referred to a neurologist for further evaluation. Take care and do keep us posted.
Sounds suspiciously like a migraine. The throbbing and pulsing can be very scary if you are not fully certain it is a migraine. Best treatment is to try and stay calm, Mersyndol or Zavance, stay in a dark room, plenty of fluids. When you feel better - go to you GP and get checked out.
Good Luck
Maybe once before a couple of years back, i remember the blurred flickering vision but not the migraine.
You could be experiencing a migraine. Has this ever happened to you before?