Hello Marj. It is quite common, and nothing to do with CS. It is commonly referred to as post-partum blues.
To support the pregnancy, your body produced some hormones. After delivery, the hormonal levels change, and this may cause changes in your affect (or as we commonly call it, the mood). Just ensure that your baby is well cared for. In no time, your whole world would be wrapped around your tiny tot and you would forget all about this!
Don't feel guilty. A lot of women go through this.
Magbasa pa
Momsy of 1 fun loving little heart throb