Cause of headache??

Since yesterday, i have been having this straining sharp pain on the right side of my head... its like my vein is been stretched to the max... i wish i can take it away... you can feel the vein with its in pain.... Regardless if i laugh or think of something and even if i am not doing anything... the pain will still come and go.... So irritating and painful... i hope it is not a start of a migraine..