Low back pain does not merely arise from your discs (inter-vertebral Discs) alone. There are many other reasons which can cause low back pain, like strained Muscles in the area, faulty postures of sitting and standing, faulty posture while bending and lifting, weak core muscles in the abdomen, etc.
Cervicogenic headache is a term which refers to headache arising out of the neck. It doesn’t come from the head per se. It originates from the structures around the upper neck and spreads across the back of the head and sometimes to the sides as well till the eyes.