TG, my thoughts are with you. Been there, and all that. Just a word of caution: if they send him for an MRI, make sure it is with and without contrast. Is he seeing a neurologist?
A word of advice: have him keep a symptom diary. It should be simple, just date, time, and what he was feeling or what happened. This will help the dr to get a full picture of how whatever-it-is is affecting him.
Don't worry until you know you have something to worry about. Getting a diagnosis doesn't change anything, it just means you know what to treat.
We'll be waiting for your results!
If it can't be fixed with chocolate... why bother?