Talk to Gynecologist on Pregnancy: High Amniotic Fluid Index At 29 Weeks

Hi I am 29 Weeks Pregnant with my 1st Baby. In my Anamoly Scan (at 22 weeks) my Amniotic Fluid Index #AFI was in Upper Normal Limit which was 24. I had Oral Glucose Tolerance Test last week. Result shows that Suger Level is Fine. Today I had Growth Scan at 29 Weeks. My AFI is still 21.2 cm, rest everything is fine related to me and baby. (Baby Weight is 1.3 Kg, my HB is 11, EDD according to LMP and USG is Same) My Gynaecologist said as I am not Diabetic so reason of this much High AFI is Unknown. Doctor marked it as Polyhydramnios. She has prescribed me Indocin Tablet which I will start at 31 week to reduce Amniotic Fluid. And she asked to start take Duphaston. I have follow up appointment after 2 weeks. Doctor also asked my to avoid any Physical exertion as It can rupture Water Bag. I am following Doctor's advice but I want to know success stories. Doctor is going right with the treatment? What other precautions I can take?