I woke with a really terrible headache & was sensitive to light. It felt similar to a headache I get when I am hungover. Was it a migraine?
Possibly. It is possible what you experienced was a migraine, however, headaches can be caused by a number of possibilities. These include hormonal fluctuations, dehydration, muscle tension, sinus/allergy issues, infections, migraines, tumors, and a number of other medical issues. Best to see your doctor to narrow the cause before assuming a migraine.
Maybe. Please see your doctor to have this checked out. If it was a migraine, there are medicines which can make it less of a bother.