Thanks for writing in.
After child birth, women do experience hormonal
imbalance but after about 6 month it becomes normal [but indivisual variations do occur].
As per your history, you are having regular periods after child birth. It indicates that hormonal balance is good now.
The symptoms you are suggesting is like vaginal itching
is not normal and can not be attributed to hormonal imbalance. You need to get detail vaginal examination to rule out local causes like vaginitis
i.e inflammatory lesions.
Headache could be because of delayed periods or stress
I hope I have answered your query. In case of doubt feel free to revert back.