Hello and hope you are doing well.
Sometimes migraines can cause these odd sensations without an actual headache. If you have blurring of vision, nausea and see some light flashes it could most probably be due to a migraine.
Cure can be in terms of avoiding trigger factors. You can prevent the occurrence of headaches by avoiding trigger factors that induce an attack. Alcohol, smoking, altered sleep patterns, missed meals, loud sounds, odd smells, physical or emotional stress and certain additive foods are known to trigger attacks. In short if you eat a well balanced diet, exercise moderately and leads a stress free life then you will be successful in preventing attacks.
Hope this helped and do keep us posted.
Thank you. I have heard his book mentioned to me several times!! It must be good. Thanks.
Check out the 1-2-3 diet by Dr. David Buchholz. AWESOME. I have suffered from chronic migraines since I was 6 years old and found this solution only recently. It does help, and has helped at least 2 other friends of mine following it as well. There is a lot if his research and information in there you might find helpful about the migraine process -- what you are talking about where the actual headache is only part of the issue.