How Can Severe Throbbing In Forehead Be Treated?

I sometimes get severe throbbing in my forehead. Its mainly if I move to quickly But also occurs if i laugh too hard and sometimes the pain lingers for a couple of hours after, similar to a headache but its noy. The first time it happened i had donated blood that morning and that night was at uni watching a football match when I stood up because we scored a try. The pain was so bad it put me straight back down in my seat. It lasts for about 10-15 seconds then goes away but its so intense it almost makes me cry. This has happened on and off for 10 years but now after it happens it continues with smaller movements but the pain is still the same and lingers for a few hours like a headache.