You have my sympathies! I suffered AWFUL headaches when pg with DD. Try:
Paracetamol. Is okay to take infrequently whilst pregnant, but follow it with a strong cup of coffee.
Get a good foot massage too, as massaging certain pressure points in your feet can help relieve a headache.
Get up at EXACTLY the same time every morning. A lie in often brought on a headache with me - not sure why!
Rub the 'V' of skin between your thumb and forefinger on the back of your hand firmly.
Get in the shower and blast your head alternately with cold and hot water...opens constricted blood vessels or something...?
Drink plenty of water and stay hydrated! And eat small, regular meals too.
Cooling head strips and / or those forehead sticks helped a little, as did a vicks inhaler.
Alternating cold / warm compress on back of neck and forehead.
Hope it gets better soon.