I'm sorry; and believe it or not, I sympathize. When people become parents, they DO lose all the freedom they used to have in abundance, contrary to what they may have been led to BELIEVE by those who had a pro-baby agenda. I hope you don't have TOO many children, I made the decision for myself to stop at ONE. Being what I call a "done after one" mom has made being a parent much easier. And I had considerable pressure from former in-laws to "have another baby, what's one more?" after DS started school full-time, but thankfully I was able to resist it.A little of both it sucks and I miss my freedom I use to have. I had to sale my sports car and now I consistently live paycheck to paycheck. And now my wife nags more than ever if I could go back in time I would.
Your kind of unhappy situation is why I believe it is vital that both partners discuss the "kids or no kids" question thoroughly long before marriage is even considered, let alone taken place. If one partner knows he or she doesn't ever want children and the other partner does, then it ISN'T a good idea for the particular couple to get married. Sooner or later, the kids issue will end the marriage, it's just a matter of time.
Unfortunately, in your case, it is now too late. I would just say that you should probably take serious precautions to make sure another pregnancy is avoided. How you do that is up to you.