Thank you for posting your query at DoctorSpring.com
There is no role of medicines in Incisional hernia.
Whether the content of hernial sac is Omental fat or Intestine, Surgery has to be done.
In course of time, the hernial sac may become bigger and intestine may enter into it.If it gets obstructed, chances of Gangrene of the bowel will increase.
So,to prevent further complications,it is better to go for Hernioplasty, i.e mesh repair.
Unless there are severe contraindications like Cardiac disease, Clotting abnormalities, not fit for surgery etc , you can proceed with surgery.
Nothing to worry.
Hope I answered your query.
If you have any questions, I will clarify further.
Wish you good health.