10 year old girl has frontal headaches for a month. Pain meds do nothing. Checked blood eyes ENT MRI &neurologist. Nothing wrong. Began after Mexico trip?

Further evaluation. See an infectious disease specialist; could have contracted an obscure infection. Certainly, this new-onset problem is unusual for one so young and healthy. .
Insufficient info. ? BP, Contacts, Unusual diet, other drugs, (recreational or otherwise), sun, eyestrain, diary of possibly contributing events, food coloring, etc.