Headaches are a good sign; if something causes you to get a headache, stop doing it.
For example, I’m starting to realize that spray paint is very toxic. Whenever I do it, and I’m in the vicinity of spray paint, I get really bad headaches.
Also the funny thing with coffee; sometimes if you don’t have enough coffee, you have a headache. But sometimes when you drink too much coffee, you also get a headache.
I also suppose metaphorically, don’t do things or deal with things which cause you to get a headache, people who give you headaches etc.
Maybe also conversely; do things which relieve you have headaches. For example going to the gym, hot sauna, being in the wild outdoors, going to the park, fresh air and sunlight.
