From what I've learned auras can manifest in all kids of manners and that's one of the prevalent ones. I have a few friends with migraines and that's common for them as well. There's a really, really strong correlation between the mechanisms at work in Epilepsy and migraines.

to me that's a pretty good indication that there must be hormonal fluctuations before a seizure. Sorry to hear you're suffering from the condition, it must not be pleasant.