Hi, Welcome to Health care magic forum.
You are 78 years female, When you sat up, had a click sound, and increased to whole head, and remain all the day.
It appears to be the muscle
twitch, or a anxity, or tension head ache.Some times the blood pressure may raise for no reason, or tension,or high salt diet.
I advise you to consult a physician for diagnosis and treatment.
Take more of green leafy vegetables, pulses, sprouts, and protein rich foods to maintain a good health.
Wishing for a quick and complete recovery. Thank you.