J.G.
Talk to your doctor about getting a referral to a reproductive endocrinologist (unless you are already seeing one). I am also 36 and have had several miscarriages as well. (also have a son who will be 2 in Feb) I did not have to have a D&C with any of my miscarriages, but I did end up seeing a specialist after my last m/c. I'm not sure if scar tissue on the uterine wall is a risk of D&C, but there is a test they can perform -- I can't remember the name -- that involves shooting dye into your unterine cavity to see if scar tissue is your issue. By the way, I'm now pregnant with #2 (14 weeks, due early July), so stay positive. Your body has done this before, you can do it again.