Re: 36 weeks pregnant and very upset!
I can tell you my sister in law went through this. She was ALSO gestational diabetic. She went in for her check up around week 39 and the doctor decided to wait another week. Knowing the baby was going to be big. The following week, she went in again, they took an ultrasound..........the poor baby was OFF the charts! They rushed her to the hospital and performed a c-section. The baby can easily go into distress being so huge. She came out 11 lbs 10.5 oz! Our little sumo wrestler!
What I know about gestational diabetic babies is that they get big fast, but their lungs are slower to develop. I would insist on them taking that amnio test (they stick in a needle and draw amniotic fluid. If it comes out clear, the lungs have developed).
I must assume that they are putting monitors on you when you go in to hear the heart rate of the baby and take an ultrasound. They should be hearing the decrease if there is one. How often are you going now?
Remember, you are still the one the doctors need to listen to. This baby is in your tummy telling you all sorts of things. Insist on being heard!