found in nature pain killers

I suffer from migranes, and am a big boob when it comes to pain. We do have some ibuprofin in our food storage but I think I would rather hold onto that in case of severe pain. I have books that talk about plants that are natural pain killers but I am a little scared to try them. Has anyone else had to resort to this? Or done it as an experiment? How effective was it? Any side effects?