A DQ and the waiver proocess is exactly what kp is trying to illustrate.
This is not just about him, but everone that will be involved in the mission, which can impact the mission. Deployed to Afghanistan or a flier and it is going to be an issue.
As always stated it is case by case. Be honest. If a remedial or DQ comes down, then work the system, until that point, get his medical records in order.
Hope for the best, but prepare for the worst.
My DIL gets migraines, light sensitivity, vomiting, etc. Motrin doesn't work for her. Was he diagnosed with migraines? Or are you assuming it is migraines? If it is the latter, than he will have to go through the system because it is a diagnosis and in his records.