Throbbing sensation in forehead and twitching in the right eye may be due to a simple refractive error
in eyes. You should find out your visual status and if there is a defect in the vision you should go for correction of the same. Also, you should know the status of your blood pressure. In case you are hypertensive, you should consult a physician for getting the treatment for the same. It is only after ruling out the simple things you should go for CT scan
etc. To my mind, it is a simple headache which should not be life threatening.