Am I having a migraine?

The pain is localized around the right side of my head and my right eye. It's not throbbing or tingling. I'm finding it very hard to concentrate on anything, and noise and light make it worse. I had no blind spots or tingling sensation before the pain started. I feel slightly nauseous. It feels like I have a fever, but I can't find a thermometer to check. I do have a history of headaches. (There was a period of about 6 months several years ago when I had almost constant headaches, but some physical therapy to loosen muscles resolved that.) Migraine or severe headache?