Momof4, I worked full-time (or close to it) with 5 children also k”ah. I agree with rebetzin about letting the cleaning go as much as possible. Also try to keep meals simple, including shabbos meals.
Most important, don’t let negative comments from others let you feel bad about yourself. Every minute that you are working you are helping to provide food, clothing, shelter, and tuition to your family, and easing your husband’s task of providing financial support. You don’t need that negativity in your life.