S.T.
I feel so much for you right now! I am also 29 and pregnant with #5. I can't imagine how that would feel.
Some of your symptoms I also experienced during my last pregnancy and following, (and I had my fourth c-section) so some of it really could be related to the c-section. I think rather then worrying too much about it right now, pray fervently, love your children like crazy, and wait for the new results.
You have my prayers,
S. (mom to 6 YO girl 5 YO girl, 3 1/2 YO girl, 21 month old girl, due with a boy in a couple of months)