What Causes Persistent Headaches,dizziness And Pressure In Head?

Hi IVE HAD THIS ONGOING HEADACHE FOR THE LAST 4 WEEKS NOW SYMPTOMS IM GETTING IS ALOT OF PRESSURE IN MY HEAD SOME DIZZYNESS AND THIS FEELING OF LIKE A DRIP OF WATER IS RUNNING DOWN MY FOREHEAD WHICH THEN MAKES ME FROWN THIS THEN RELIVES THE SENSATION THEN 30SECONDS LATER ITS BACK AGAIN IT GETS WORSE THROUGHOUT THE DAY WHEN I WAKE UP IN THE MORNING FOR ABOUT 20MINS ITS NOT TOO BAD BUT BY BED TIME I FEEL LIKE MY HEADS GOING TO EXPLODE ALSO I FIND I GET RELIEF FROM WEARING A BASEBALL CAP PLS HELP