Migraines can cause a stroke, but that would be extraordinarily rare. If you do not have stroke-like symptoms with your migraines (such as weakness of an arm, leg, or part
of your face; or numbness in those same areas) it is very unlikely that you would ever suffer a stroke. That said, if a migraine goes on for a very long time, it can leave a very tiny scar in the brain.
It sounds to me like you need to see a Neurologist or Headache specialist right away. It is worth traveling for this. They can help you tailor a medication regimen, help you avoid headache triggers, and help you break the cycle of your chronic headaches.
Your headaches sound severe and chronic enough that a general Neurologist may refer you to a specific Headache specialist for more thorough care. Headache specialists are located throughout the country, and in most cases, there is one within a few hours drive. Good luck!