I have a severe headache, what should I do?

I think it might be a migraine, but it is behind my right eye. It has been going and coming for about 2 weeks now and I have only been taking OTC pain relievers for it. I know I need to see the doctor, as I am waiting for an appointment. I don't know what triggers them, I have not had them before, I'm not really that sensative to light, and sometimes I feel nauseous. The other night I woke up with one really bad and couldn't go back to sleep till after I took some meds.