Hello...... They may prescribe you medicine  with different brand,  follow any one doctor,  polycystic  ovarian syndrome is the most common cause for irregular periods in these days. It's due to hormonal imbalance between LG and FSH. Common  symptoms  are irregular periods,hirsutism, weight gain.. It's long term problem..  Reduction in weight  shows significant improvement in pcos... Difficulty in pregnancy is common problem with pcos. Oral contraceptive pills regularise periods with minimal bleeding