I Had An Umbilical Hernia. The Surgeon Suggested The Robotic

I had an umbilical hernia. The surgeon suggested the Robotic repair with mesh. After 4 1/2 weeks, I am expirencing a deep ache throughout my entire abdomen. It's feels full and sever ache pain. I can feel this on my sides going toward my bac.Sometimes it hurts so much I have to stop what I am doing for a bit. Why is this so painful?