My wife and I decided to get married after she became pregnant with our first child. Within the next 2 yrs...?

we had 2 more children. We now have a 3 yr old, soon to be 2 yr old, and 6 1/2 month old (along with a soon to be 9 yr old from a previous relationship half the time). My wife and I spend our time bickering at each other every day it seems because we are constantly frustrated at the lack of control and organization our house and life has taken with 3 little ones so soon... we've found little time alone obviously and are starting to see each other negatively it seems... any insight or ideas?