Info on opthalmic migraine

Yes, I have had these types of occurrances since I was about 14...also my mother suffered the same episodes....All of a sudden you will feel like you can only see 1/2 of everything and then gradually you loose focus but you can set your watch to it 20 minutes and they are gone...you sometimes have a slight dull headache and sometimes none at all....it just makes me worry about when the next one is coming and throws me into a panic attack....I have one about every 6 months but I now go to a neurologist every 6 mos and I take verapamil before I go to sleep at night b/c it helps with migraines...the last one I had was in May and it lasted 20 minutes.  I have had to pull of the road when I get one and my mom has had to do the same.....but what I have read about them is that they are not harmful except for the worry that you will have one when you don't want to....Have you had anymore?  Veronica