scary headaches...need insight

i'VE BEEN GETTING THESE PRETTY painful headsches for about the past year. Usually a few times a month. They come on gradually so I can usually tell when I'm going to get one.Almost always on the right side in the temple, forhead and above the eye. Some days they are worse than others but It almost always helps if I take a nap. Advil doesnt work except to lessen the pain. They go away after I sleep except for yesterday....I woke up this morning and I stll have a headache...not severe, mild.

I also feel alot of pressure and tightnes in the forehead area....tends to come and go. I can't figure out what the cause maybe. I'm scared it could be something serious! I never really had a prob with headaches before this. Anyone feeling the same thing???