Pain in head on right side radiating from tip of forehead to scalp. Tender to touch and head throbs. Pain gets severe when lying down. Please help!

Headache. Need more info about your age and the headaches . But generally possibilities are sinus headache , migraine . If you are younger in age and like to think of temporal arthritis if somewhat older . But increase water intake and see your PCP so a proper evaluation can be done.