I feel out of control...

Alisha • Mama of 3. #4 on the way...but feels like the first time every time.
This is my second GD pregnancy. The first one was well controlled with diet. This one I am having a much harder time controlling. My morning fasting is always high. And my after meals are hit and miss. I stared glyburide 2.5mg twice a day. I have borderline Polyhydramnios. 
I am just wondering if anyone has had any success with glyburide helping to regular fluid levels and #s.