TIAs vs Migraines vs seizure?

[Annierae51]

Over a month ago an Urgent Care Physician sent me to the ER with droopiness in my face (left side), slurred speech, (I knew what I wanted to say, and was able to say it but the speech was just slurred) numbness on the left side of my face and mouth, slight weakness of arm and leg on the left side, visual deficits (a dark comma shape in my peripheral vision on the left and only able to follow my hand out to about 45 degrees if looking straight ahead.)  It developed over a period of several hours and was still present when they sent me home after a normal CT.  I have a history of a Post-Polio diagnosis (in 1995).  Since then have had a Carotid Duplex, an MRI with and without contrast, all "normal", and am scheduled for an MRA next week.  
      No history of migraines.  Do have a history of mild seizures and have been on Tegretol for 25 years.
The Post-Polio (if indeed that is what this is) has added a cane, leg braces bilaterally, and a power chair as additions to my mobility since the diagnosis of PPS was made, due to the  muscle weaknss of both legs.  I've also developed several sleep disorders including "Alpha Wave Intrusions", a big problem with Restless Legs and sleep apnea due to weak diaphragm muscles.  
    The worrisome thing is that these (TIA?) episodes are continuing.  I have had six of them within three weeks, and as of this week  have had double vision that has continued for six days now--in the left eye only--the vision in my right eye is very clear and crisp. I still cannot feel myself smile on the left side but it looks ok in the mirror.
    I know the Neurologist may be looking at lots of different things; I suppose my question is, is there a certain order in which they rule out things before they begin looking into others, rather than just beginning to do a "blanket" check for all sorts of things?  Or is that just a matter of Physician Preference?  And what other things is he likely to be looking for?  MS?  ALS?
     Thanks in advance.

[Annierae51]

Sorry!  I also had an Opthalmology exam who reported that there was nothing in the vessels or the retina that would show a reason for these types of episodes.  That was prior to the beginning of the double-vision in my left eye, and I'm scheduled to go back for a repeat exam on March 11th.

[Annierae51]

I failed to  mention that I also had a Trans-esophageal echo to check for heart problems that showed a 1+ Mitral regurgitation, trace of aortic insufficiency, trace Tricuspid regurgitation, mild LVH and no evidence of any clots, masses or vegatations.  EF was 60%.

Annierae