Hi,I'm 18 yrs old n I had my first periods at the age of 14..when I ws 15,I my periods took 18 or 21 days ..den. I had to go n stay at hostel for two years n d problem continued n I startd havin pimples all over my face raelly badly...den a gynaec asked me to take some medicines(sorry I dont remember d name)n periods wer stopped for a month..but the next periods wer accompanied wd really bad cramps(usually I dont hv cramps during periods)..after dat things wer smooth for a while..I reduced my trans fat intake n ws on a somwat healthier diet...but now I changed my scool n went to another hostel n this s d second month n im hvin periods for more than18days...dont kno wts wrong wd my system n I really want to kno d reasons...pls help