I have three very good friends. Two of them cringe at the thought of delivering another baby. (Well actually one not so much anymore because she ended up with a C-section) But they can't even think about that part of it. My one friend pushed for hours only to end in a C-section and the other one said it was just and overall traumatic experience for her...even though both babies were born healthy.
Then there is my other friend and me and we cringe at the thought of going through nine months of pregnancy. I had a relatively healthy/normal nine months with no serious issues. But there was heartburn beyond belief! And I hated the whole sugar test. I hated the leg cramps at night! The constant dr visits. And I had a few other issues to boot. My other friend had constant bleeding with her first that made her worry the whole pregnancy on top of all the normal pregnancy related things, heartburn, leg cramps...etc. But we both had easy deliveries. We both have said we would delivery any day over going through the nine months prior.
So, yes, I think what your feeling is normal. Somehow, I think ultimately what makes you go through it again is the fact that the little bundle of joy makes up for the hard parts. But, when your done, you'll rejoice in the fact you don't have to do it again. Or at least that is what I did. :)