Hi S.,
I went through the exact same thing...with my first daughter, I was stricken with preeclampsia at 34 weeks and they held me off until 35 and 2 days when they had to do a c-section. Prior to the actual birth, I wasn't allowed to eat for about 40 hours, barely could drink...because they didn't know when/if I was going to have a c-section or the pitocin would kick and they tried prolong it as much as possible). During the actual operation I was so dazed and confused I barely knew where I was.
When I got pregnant again, when my oldest daughter was 6 months (I know, I'm crazy), I immediately said I wanted to try the VBAC. My doctor was initially supportive, but kinda talked me out of it for safety sake. I was all for it, but then about 2 weeks before I started having the same problems as you are...couldn't sleep, even had problems with anxiety for the first time in my life. Once the day came, and I went through it, I wondered how I could have worried so much. The actually procedure was nothing like I remembered - it was so calm and peaceful...and quick. In retrospect, I wish I would have known in advance how much easier it was going to be. Even the recovery...the doctor used this "pain pump" thing that is actually sewn into the incision and then removed before you leave the hospital (sounds weird, but it is amazing, and the removal doesn't hurt a bit).
I wish you all the best with your new addition - just relax and enjoy the last few weeks you have to dote on your son and hubby uninterrupted (the remaining baby preparations can wait...he/she only needs you)!
A.