I have had a headache for 4 days now, it s pretty bad, it gets worse, especially as the day goes on. And it causes me to have a very hard time sleeping at night, and wakes me up several times throughout the night as well. I ve also had a cold for over a week, but that s getting better and now the headache is getting worse. I thought it was a sinus infection but almost all cold symptoms are gone and the headache remains, bad. What could it be?