For the past couple months my husband has been having dizzy spells followed by a headache above his left eye that sometimes reaches the back of his head.it lasts from 5min to an hour. what could this be?

See your doctor: With these kinds of symptoms and their persistent nature, it's best if you see your doctor. He/she will listen to you, do an examination, possibly run some tests and let you know what's going on.

Could be serious: Potentially, these are migraines, but these usually don't start in adulthood, though rarely they can.Must consider other possibilities from seizure disorder to aneurysm, both of which could be serious.Less serious problems could be caused by neck or cranial bone dysfunction.A thorough history & phys incl. Osteopathic hands-on exam & other testing, if needed, could help find & fix the cause.

Anything: These symptoms could be a simple migraine but could also be something more serious. If these are new symptoms, they definitely need to be evaluated by a physician. If these have been ongoing for years, it is likely not as serious. This is a loaded question for any doctor even in an office setting, let alone online. To be blunt, the worse case scenario needs to be ruled out by a physician in person.