I probably should go see a doctor, but I'll ask the MR community first: I've had this headache for 5 days straight now. It never goes away. My head only hurts when I shake my head or tilt it back quickly. It's on the back part of my cranium that sticks out. It hasn't been painful enough to keep me away from doing my work when I'm moving my head, and since it doesn't hurt when I'm sitting, it doesn't really matter. I thought maybe I hit my head on something, but that's not the case. I thought maybe something is wrong with my pillow, but it seems soft and fluffy to me. And I feel no pain when I'm lying down. Now, I have been deprived of sleep this whole week, pretty much. I've been sleeping at midnight or 1 AM till 6 AM during the weekday. Last night I got about 10 hours of sleep and Friday night I got about 8 hours, and I've taken a few naps. So, I'm thinking maybe it's not sleep deprivation. I've taken some Tylenol on a few of those days, but that doesn't make anything better. So, what could it be?