Welcome to our headache forum Denise and welcome to Neurotalk.
Migraines are strange disorders, I will admit that. I have suffered from them since I was in my early twenties and have had all sorts of symptoms but can't say I have had a TIA. I do have MS and have had one bout of seizures associated with this wonderful disease so can relate to the seizure issue.
I have been through every medication, therapy and combinations of both to try to get a handle on them and after giving up and learning to just deal with them, my neurologist put me on Topamax. It doesn't work for everyone, but it certainly has for me.
I hope someone else in the forum can answer your TIA/Migraine question but in the meantime, check out the sticky at the top of the forum for some related links with information. Maybe there is something useful.
If you come across some helpful information, please pass it along so I (or one of the other moderators) can add it to the list.
Would you mind sharing what type of medication you are currently taking to control your migraines? Any dietary controls?
Nice to meet you and I hope you find some relief.