Even before I arrived home, I took the advice of my health officer and arranged my appointment with a Neurologist. As luck would have it I was able to see an excellent neurologist at the soonest plausible date! He didn't tell me much unexpected - but he did say that he wasn't confident my sinus issues were causing my migraines, though he felt they might be making them worse. Might be.
In any case, this man is the key. My perception of things is that the best chance I have of appealing this decision and applying for reinstatement is to find an effective treatment for my migraines that I can live with, and to do so as soon as possible. He is an excellent neurologist, and he's convinced me to give Topomax a chance, as well as Imatrex (ironically a combination of treatments I was already getting while I was in the Peace Corps).
So I've got this treatment now, and another appointment in early august. I'm keeping a migraine calendar for him and hopefully, next time I see him, he'll be willing to write a letter saying that I'm healthy enough for Peace Corps service - a letter that should fuel my reinstatement. Unfortunately, this puts me back in the Philippines by mid-august at the absolute earliest.
And of course there are hitches in a plan like this; ie I need medicine. And when I dropped my prescriptions off at the pharmacy, I quickly learned that my new peace corps insurance doesn't know who I am. Not the pharmacy services branch anyway (they're being paid by a company, who's paid by another company, who's paid by another company, who's paid by peace corps, or so my phone calls have informed me). But that was days ago, and as of this afternoon, I think that's been solved. I'll find out soon.