Your are most likely suffering from visual aura of migraine headaches. You didn t mention this in your note but often what happens after the aura goes away (5-60 min. duration) is a terrific headache with nausea/vomiting, and there are other very bothersome and debilitating symptoms. I am actually a headache specialist and would be very happy to work with you on a 1-1 basis to try and figure out what you ve got and point you in the direction of treating these things with definitive means so as to minimize the chances that they should progress to anything more serious. If this interests you then, please contact me at the following address: bit.ly/drdariushsaghafi I will then, respond to your query within 24hrs (usually much less) and we can open up a consultative dialog to approach these from an organized and formal perspective and nip them in the bud before they get out of hand. Be well! P.S. Would you give a little bit of a brief feedback for my answer if you feel it has meritorious information and also give it a STAR RATING? Many Thanks!