I remember when I had to keep the house 'show' ready at a moments notice. At the same time I had started working fulltime after being a SAHM for many years, and I was also trying to pack up/clean out what I could, PLUS all the outside maintenance. In other words, I was doing it all.
We only have so much that we can handle without something slipping our mind. I'm so sorry how you feel, but totally understand. We mothers are really good at the self-guilt game. Your son may have been disappointed, but he still loves you with all his heart...and you'll have other special moments you'll be able to share with him.
Women are angels. And when someone breaks our wings, we simply continue to fly...on a broomstick. We are flexible