I have to say I definitely felt alot worse with my second pregnancy
I think alot of it is to with the fact that with the first one you have no other children to take care of, so you get to play "princess" a bit - sleeping in when you need it, sleeping during the day, molly-coddled by everyone around you etc.
Second time around you have a toddler to deal with who has needs and couldn't care less how you feel. Plus you don't get the extra sleep either.
The beginning of my second pregnancy just sucked, I really didn't enjoy it much at all. I really found it hard, I was working full time too and then coming home to a toddler...I liked the first time better LOL.