my daughter is 18 and her period at the begining was regular and then started to be every two monthes then now for five monthes no period and she is virgin. she gains weight of unknown reason ispite her diet the same and suffers from sever attacks of headache and lower abdominal pain which last for one or two minutes, and she always depressed and nervous. I am so worried about her and she is busy now in exams and I do not want to disturb her untill to finish them then to seek for a medical advise. so would uoy please can you exolain to me what is the reason for that problem.