Hi Donald,
No, Migraine disease is not a mental disorder. It is a genetic neurologic condition. Has he been diagnosed with Migraines? How often is he getting a Migraine attack? It may be time for him to see a Migraine specialist, the expert who treats people with Migraines and headaches. Our patient recommended specialist is HERE.
Your friend may have Migraine attacks in school for a number of reasons, none of which we can be sure of because we are not medical professionals. Fluorescent lights, weather changes, chocolate, and a poor quality of sleep can all trigger a Migraine attack for some people. If your friend is staying and/or waking up late on the weekends, this interrupted sleep schedule may trigger an attack on Mondays. Our Migraine Trigger page has valuable information you can share with your friend, click HERE for that. On that page there is also a Migraine diary which is a good idea for your friend to keep to see what is and isn't working to help his Migraines. Your Migraine and Headache Diary.
Here is some information to share with your friend: People who have a long history with Migraine and /or frequent attacks are at increased risk of silent brain damage. Yes, Migraines Can Cause Brain Damage.
Why don't you tell your friend about this site and he can come for information and support.
Good luck
Nancy