it gets better with a tablet of panadol,
Sounds troublesome.
Simple headaches can occur from excess stress, muscle tension, nerve disease, TMJ, spine disease, high blood pressure, and from many other exotic reasons -- some of them medically dangerous. They also occur as part of the caffeine withdrawal syndrome for those who enjoy drinking a lot of coffee.
If your headaches are not relieved with an OTC remedy like aspirin and rest, you might consider seeing your doctor for a workup.