I don't think anyone here can diagnose your problem, but you really should take some comfort by your doctor's being pretty sure that you have migraine headaches. They may not be fun, but they won't kill you, and they can be treated.
Is there anything you can do to relax (meditate a lot, yoga, tai chi, etc.) until the MRI results are available? Is there any way you can get the radiologist (or whoever will examine the image) to expedite the process? Don't wait until they call you with the results, unless you're certain they'll contact you as soon as they're ready. Call your doctor's office to find out when the results will be ready....and don't take "in two weeks" for an answer.
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Our lives begin to end the day we become silent about things that matter. -- MLK
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