Wow, I have alot to add here....so bear with me!
Let me start by saying that I have had all of my children by c-section (7 kids, 6 c-sections........a set of twins came last)...and I am pregnant again.
The first child was born by emergancy c-section, the second the Dr. wanted a VBAC, the baby was not responding well to the pitocin and was another c-section and the rest of the c-sections were because I had already had 2 c-sections. The doctor was not even worried about my old c-section scars spliting and when I was pregnant and having the twins (I had 5 previous c-sections by that time).....he said that if I felt burning in the area at anytime to let him know and we would do a blood test to see if I was rupturing. I had gestation diabetes for my 5th pregnancy and everything went fine! I did not get it with the twins pregnancy (I was tested 3 different times just to make sure).
Doctors are the ones that went to school for many years, they have seen many patients, etc. The doctor cannot just give a c-section for "no medical reason" especiallly at 37 weeks. The doctors have to do what is best for the patient, not just what the patient wants.
I understand that the last delivery was NOT a good one, but all pregnancies are different, even pregnancies in the same woman. Every pregnancy was different for me and every time it was getting close to delivery time (c-sections my doctor would deliver at 38 weeks), I had to have an anmio to make sure that the lungs were ready........why would a mother WANT to have her baby born early and just ask for medical problems?
I understand that you are scared, but truthfully the doctor is doing what is best for your baby and your body....he is not there to be told by you what is best. I hate to sound harsh, but he is just doing his job. You also stated that you had GD with your last baby.....you have said nothing about having GD THIS time.