Lovelace

Not sure if this belongs here or under vision problems, but I figured I'd get some input from people who know about migraines.

I've been having visual disturbances off and on all day for about three months. I see sparkles, dancing squiggles, dark spots, distorted colors, blackened crescent shapes, and various other things. It happens in both eyes. I saw an ophthalmologist today, and they said the inside of my eyes look completely normal. My retinas are healthy and my optic nerve doesn't appear inflamed or anything. The doctor believes I am suffering from ocular migraines, but that just doesn't sit right with me. For one, the headaches I get are usually tension headaches, and they occur independently of the visual symptoms. While they are often relieved by caffeine, caffeine doesn't necessarily get rid of both symptoms, which doesn't seem to make sense; if I'm having a migraine with symptoms, then shouldn't the caffeine get rid of the aura if it gets rid of the headache or vice versa?

My main issue, though, is that this is happening all day long from the moment I wake up to the moment I go to sleep. I do get occasional breaks of one or two hours where the visual problems will become milder or disappear, but for the most part, it's constant. Since migraines are caused by the constriction of blood vessels, it seems rather troubling to me that I my blood vessels should be constricted for long periods of time. Something's not right if that's happening so frequently. From what I've read the visual symptoms of an ocular migraine are generally short and don't usually last more than an hour at a time if even that. What do you think? Do I need to see another doctor and get a second opinion, or do I need to be seeing a different kind of doctor? Is there something I'm not understanding right?