Frequent Headaches. To avoid headaches?

Hi There, Could someone please advise what could be the possible reasons for my wife's frequent bout of headaches everytime she does something away from usual. She is 33 years old, height 5 feet and weight 57 kgs. I mean, her headache starts at the drop of a hat and am really worried about it. Her pain fluctuates from back of the head to sometime left or right side of the brain. For e.g. if in May she had pain on right side then in June its on left or back of the head. My observation of what triggers it is - sleeping less than 6-7 hours, reading books for more than an hour, any pressure cooker situation or panic etc. She usually has to consume paracetamol to feel better and relieved. Can someone pls suggest is this a cause of worry? Any advise on what tests I should ask her to take in hospital to ensure her brain is healthy? Additionally, any further advise is welcome in suggesting what she should stop doing or start doing to avoid headaches?