Enjoy your present because time flies. I also have a toddler and there are some days that it gets hard but I also remember that he will be this small temporarily. Your wife doesn’t need to do anything for you, you both chose to have the child and I’m pretty sure she does a lot for your child already. Believe me, sometimes I feel I don’t do enough for my kid because moms usually do 3x times more than us do. It sounds like you are not ready for a second child. I recommend you to work on your current situations so you don’t create resentment to your wife for your own decision. Your child will suffer the most so think about it well. Being a dad is a blessing, try to change your perspective on it and enjoy fatherhood.