How can I find a doctor knowledgeable and experienced in taking care of people with persistent aura?

Look for a neurologist with an interest in migraines. A teaching hospital would be good place to go - since their doctors are likely to be interested in unusual cases.

You may carry a copy of the webpages on diagnostic criteria and therapy of persistent aura without infarction to your doctor to provide him or her with an up-to-date information on this complication of migraine with aura.