C-sections hurt way more than labor. If you're afraid of the pain of childbirth, ask for an epidural. You'll feel sore afterward, but nowhere near as sore as you'll feel if you've had your abdominal muscles cut open, pulled apart, and sewn back together.
Let your doctor know that you're having trouble with your prenatals. You might want to take Flintstone vitamins instead, plus a folic acid suppliment. Or you can drink Carnation Instant Breakfast plus a folic acid suppliment. Both are good sources of vitamins.
Good luck.