If you are having a severe covid headache then first you should try massaging your head and relax for a bit. If it doesn’t help then you can apply balm with diclofenac on your head. After this you are recommended to have some rest and it will cure your headache but in case it doesn’t get cured after having rest then you should contact the physician who is sitting you and ask whether you can have a paracetamol for your headache or not. If they approve consuming paracetamol for your headache then you can take the medicine according to directions and have rest.