I am a female, age 61. I have been having occasional headaches on upper left side of my head for a couple of years, not incapacitating or anything. But for the last week, the headache/pressure feeling comes suddenly whenever I bend forward (such as to pick something up) but then goes away when I straighten up. Also today during situps it would hurt every time I was supine then go away as soon as upright. So every situp was: pain, no pain, pain, no pain, etc. Thanks.