Basal migraine

I have just been diagnosed with Basal migraine. I have been dealing with migraines since 2005. The current (and second) neurologist I am seeing (since 2007) put me on Topamax and has pretty much been at a loss with me. His loss stems from the fact that my migraine has no triggers. My migraines have been less frequent on Topamax (about 2 or 3 a month) but still debilitating. I have been at a pain clininc (having nothing to do with my current neurologist) for the last 3 months dealing with another medical issue in my life. When my chronic headache issue came to light they tried another med. on me (along with the topamax) and asked me to come back and see another doc in 3 weeks (9/30/09). This doc spoke with me for 20 minutes on my medical history, gave me the full neuro exam and within MINUTES diagnosed my migraines as BASAL!! He is the president of this clinic and is very well known. I have no reason to doubt him other than the rareness of BTM. He, very distinctly and rightly so, warned me NOT to take my Imitrex anymore! I'm still in shock. I haven't had a migraine in weeks and I've got one now (I'm now into the 10th hour). I'm able to function, but sick, nauseous, dizzy and overall confused which is becoming more common. I go in for x-ray and tests the next week or so to define the distinctness of the Basal Migraine. Should I be worried?