This works ok with headaches in general too. Only if you don't have any ice you can simply massage that area with the fingers of the opposing hand. It will reduce your headache considerably. But it will return fairly quickly once you stop rubbing it in my experience. Best to use only as a stopgap until the Advil kicks in.
I'm gonna have to try that here because I just busted my finger with a mallet and I'm in serious pain as I type this one handed and try to stop bleeding.
