Stupid question time. Headaches

Okay here's the question. Do you get a headache when you start writing or typing?

I'm being serious here as I've been trying for weeks to finish a story and everytime I start or try to start to type a scene my head starts to hurt. I know the scene and where its going but when I start its like a migraine is starting up. I end up having to quit so it will go away.

If I was to do some minor editing of what I have written there isn't much of a problem.

Ibi