Hi ! Post operative scars can develop into a keloid/hypertrophic scar
which mybe painful and itchy also. I would suggest you not to scratch it as this will increase your problem if it is a keloid.
You have mentioned that the pain becomes more during every menstrual period, and that means it is regulated by your hormonal
status. This can happen if some endometrial tissue got embedded in your scar and responds to the hormonal changes just like normal endometrial tissue in the uterus. This is known as abdominal wall endometriosis
though it is not that frequent.
Whether you have got an incisional hernia
or not can be known only by clinical exmination and for this you have to visit your surgeon.
In the mean time, as you had an abdominal surgery
, please try to avoid lifting of heavy weight , as this may induce an incisional hernia.
Wishing you an early recovery.