Headaches
The herb feverfew pretty well got rid of my tension headaches, and it's supposed to be good for migraines. (My headaches were so severe that I up-chucked any thing I ate until the pain went away.)
Some sources say that you have to take it for several days so it can build up in your system. For me, it worked right away. I've not talked to anyone else who used it, so I don't have a reference.
I'm not sure where to get it. A holistic doctor I was seeing had some in liquid form. I would suspect that it would be available in at least some herb stores, or the natural foods section of grocery stores. At least in the U.S. I'm sorry that I didn't check where you lived before I posted this.
A few years ago I put three tiny plants in my herb garden, and the little beasts re-seed like mad. In my case it doesn't matter. They are lovely and I use them for bouquets and the like. Their fecundity could be a problem for others.
By the way, while the leaves and the blossoms (small, daisy-like)are lovely, the herb tastes vile. When I took it, every morning I put mayonaise and about three leaves on a piece of brown bread and folded it in half then ate it. Still not pleasant, but very, very much better than those sickening headaches.
Best wishes for a clearer head.