Hi I'm nearly 17 and have had my period for 4 years now and it is still horribly irregular. Sometimes it comes every three weeks for a few months then it can be every 6 weeks, its horrible! And I get very bad pms and cramps, so bad I find it hard to get out of bed. Also, I have had 5 yeast infections this year, either mid cycle or a week before my period. I need some advice because I'm over having the yeast infections and the irregular period. What would be the best thing for me to do?