I was gonna say Cluster Headaches too but couldn't be arsed to go into it - cos people think "yeah a headache, wow - big deal"
I get them - (well got them, touch wood I haven't had one for about 18 months).
Women who get Cluster Headaches (there's a Cluster Headaches Forum) say it's definitely worse them childbirth.
When I get one it feels like I have a big metal spike through my right eyeball going all the way through the right hand side of my brain. The pain is absolutely incredible, I find it hard to imagine how any pain could be worse. It hurts so much that you cannot keep still. It's impossible to lie in bed or sit in a chair, or anything - whatever you do doesn't help. If I had them regularly I would honestly top myself.
For comparison, I've seriously fooked myself up: broken arm x7, smashed wrist, elbow, broke my collar bone while wearing a wetsuit (try getting out of a wet suit with a broken collar bone), broken my nose 4 times (actually I didn't, other people broke it for me), had 'arc-eye' (that's really painful too), smashed my toes by dropping a mini gearbox on my foot, cut my own cyst out with a carving/bread knife, taken my own stitches out, burnt a wart off with a soldering iron, etc etc - not one of those things comes close to the pain of a cluster headache.
Isn't that right, barneybrendan?