Atypical Migraine - Help Please!

I have had migraine since I was 14 - typical migraine with aura, numbness, tingling, one-sided headache, nausea, etc.  As I got older my migraine symptoms have changed - I am now 46 (female).  I was diagnosed with complicated migraine in 2003 - neurological symptoms but no headache.  It's been fairly manageable up until now - never on meds.  About 3 months ago I had a horrible bout of vertigo - right before my period.  It lasted a day or so then went away.  The following two months after that the vertigo was increasing, still before my period but also other days of the month.  The entire month of November I had vertigo every day including ringing in my ears but no hearing loss.  I also had migraine aura every day as well - numbness, tingling, smelling weird odors, etc. but no headache.  I went to my doctor who said probably migraine and referred me to a neurologist on November 30 who diagnosed atypical migraine, gave me Elavil to try and booked me for an MRI on Jan 8 (soonest I could get in).  It is now mid December, I still have these daily symptoms, the Elavil is helping somewhat but not completely - all trial and error I am told until I find the right med and dose.  This is affecting my life - I have to work modified hours now as the off balance and dizzy feeling is still present as well as the ear ringing.  I did have a "normal" migraine a couple of days ago that included a headache - manageable with Advil. It's like I had 30 days of aura with a normal migraine headache to follow, two days of feeling great then wham, it's back again.  I also have a tightness in my throat, like I can't swallow sometimes.  I do get acid reflux once in awhile but never had that type of symptom.  

I guess my question is has anyone had a long bout of aura like this and is still continuing?  I am really scared that this is something more and dread the MRI although I know it's a good thing.  I had an MRI done 2 years ago which was normal.  Can a tumor or something like that grow in those two years to cause these symptoms?  I am getting so frustrated with everything and I'm scared to death its something more serious than atypical migraine.  Thank you!