What Causes Pain In My Forehead On Bending Or Sneezing?

for three months I suffer a sharp forehead pain all across the hairline when I cough,sneeze or bend to the floor to pick anything up.No pain when walking, sitting etc.No pain when I wake up.I wear glasses,am active,B.P. pills just been increased to 18mg.Take statins. No other medication. I am female and 74 yrs old