Headaches Every Day?

Really, I mean what am I supposed to do? I'm so tired of having a headache every night. Tylenol is no help and I drink plenty of caffeine. My head starts to hurt at about 6pm daily. And I'm sure I know why: computers, deadlines, posture, smoking it all leads to one thing. Headaches! But do I stop? No, how can I? I smoke because I want to and I work on the computer because I'm a writer and it's at this non ergonomic kichen table and chair because I don't have the space or money to upgrade. And I have to look down at the keyboard which makes my neck hurt and befor you know it my head is pounding and I don't want to go to bed because I knwo I'll just lie there and suffer. Headaches F you!