I am looking for some help. My father was in the Vietnam war and like so many others, heavily exposed to AO. Last year he began suffering from a severe headache that has been ongoing for the last year. He has had CT scans, MRI's nothing can be found. In the last 2 months, his headache has become more severe, along with dizziness, and nausea. He is at the point he can't drive. Still, no one can find the cause of this. I have read of some people who have been exposed to AO, who suffer from similar symptoms. Is there anyone who can give us some answers or point us in the right direction? Thank you.