I'm struggling because of a relentless headache.

I often experience headaches more frequently than others. I'm not particularly sensitive, so why is this happening?? Over time, I have developed various methods to cope, such as shifting my thoughts elsewhere to focus, sleeping, and so on. These methods seemed to work somewhat. However, lately, they hardly seem effective. When nothing else works, I take medication, but I am worried about developing tolerance. Why do I get headaches so often?? Is it because of my age?? Or is it due to stress?? I always carry medication because I never know when and where a headache might strike. I wish to live in a clear world without headaches.