I get blurred vision(I have 20/20 without a migraine), flashing lights where I now have a habit of asking people close to me if they see it- if not and that's 95% of the time, I know I'm getting a bad migraine. I also get nausea from them bad enough I keep altoids and Phenergan around and have been prescribed it just for that. If I don't lie down with constant ice for the really bad migraines, I will black out. It's happened 2xs. I eventually realized the feelings I had before blacking out were related to the migraines, so I know not to drive or to just pull over when it starts. I have extremely sensitivity to light and small noises during and before migraines.
I asked about topomax because it's known to at times cause pain by the eyes and I believe they say it's not reversible after damage is done- I could be wrong though. Did they see anything on your pituitary light up on any mri? It's common for people to have tiny masses/cysts and sometimes they can hemmorage and cause pain there too. Sometimes a tiny cyst can put pressure on your eyes and cause pain too. An eye surgeon can usually tell when doing an exam whether there's pressure from that though.
Feel free to message me too if you ever have any questions, I know it's very difficult to deal with. I've seen so many specialists and tried everything.