I've been having headaches for 3 days constantly. I do have severe sinus congestion and allergies, but the pain is in temples, and the top part of my head, it feels as if someone is tugging at my hair. Sometimes the area under my eyes also hurts a bit. Almost no other symptom is there, except slight nausea. I did feel dizzy while standing up but that was a week before the headaches. Nowadays I feel weak, like one feels right before getting sick. It could be sinus, but Im looking for some opinions. Any help would be appreciated.