Also, I was dx with migraines also at age 19 (as a sophomore in college) and was under treatment for those through the remainder of my college career.
That could have been the "attack" (with the blurry memory that i have for the traumatic time that I had at age 16 with my stepdad) that i had in AP biology. The attack as i descirbe it now, may not have actually been that way, i don't know, b/c certain details are blurry and my brain likely filled in the missing pieces automaticly. All i know for sure at age 16 that the possible migraine that i had HURT and was very scary!!!!
As for the double vision continuing, that may have around the same time that my brain switched from compensating for it (esophoria) to (esotrophia - where the brain doesn't compensate as well for it and it becomes more persistent). I don't remember much about that time, b/c it was such an emotionally painful time for me. So i can't remember if the vision problems started before or after the pain, i just don't remember.