Irregular periods. We go about it?

Hi, I am from Pune. My wife and I both are working. It has been two years since marriage. For one year after marriage my wife used to work in night shifts.. That led to her hormonal imbalance and irregular periods.. She suffers great pain during periods and there is unusual spotting even after periods are over. We took advice from a doc.. Initially she prescribed Tab. Pause to stop bleeding.. After that she prescribed tab. regestron for one month and tab. Daine 35 OD for 3 months. Even after this treatment she's facing irregular periods, irregular menstrual flow, headache and extreme backache during periods. 1. How should we treat her? 2. she's going through hormonal therapy.. Can this therapy lead to uterine cancer in future.. Her mother suffering from postmenopausal endometrial cancer. 3. If she's to conceive within next 6-7 months how should we go about it? Pl guide in this.. I am extremely worried ob her health.. Pl reply on this chat only.