i started taking Noriday a week ago, on the first day of my period, after a long break from any contraception , i suffer from extremely painful periods, which i am prescribed naproxen for first 48/72 hours.... subsequently endo/ menstrual pain finished but in last few days I have started getting lower abdominal pain ....period has finished so could the noriday be the problem? i am 39, slim build but a smoker