Hi, I Have A Mensural Problem. My Mensural Cycle Is

hi, i have a mensural problem. my mensural cycle is not regular. most of the time i feel the mensural sensation and below tummy line pain which usually occur before the cycle and dieria also but their is no mensuration. i really upset by this problem. kindly suggest me that dronis is good for regulating mensuration or it harmful and also prescribe me about the quantity and timming.