Reassuring that the neuro specialist couldn't find anything major, but it dissapointing that your symptoms havn't resolved.
I'm not an AME, but from years of lurking around here, it seems the CAA will be more interested in your symptoms than your medication. (I suspect that they don't have a list of "banned" medications- rather they treat each case on it's merits). Trouble with propioception/co-ordination will worry them.
Inderal will probably help half to three-quarters of migraine sufferers, but of course, you have to take it every day, as a prophylaxis.
Keep on hanging in there, be patient, most patients with migraine can be helped.
Any obvious triggers to avoid ? (Tiredness, stress, chocolate, red wine, coffee, cheese,PMT??)
Keep us posted.