Incisional hernias are relatively common after caesarean sections. The reason is that the lower half of the abdominal wall, below the umbilicus, is inherently weaker than the upper: one layer of tissue is missing. Surgeries performed in the lower abdomen more often progress to hernia.
Surgery for an incisional hernia is usually carried out by placing a mesh to cover the hernia hole. The mesh is made of polypropylene. The recurrence rate is about 5% or less if a mesh is used, and is about 40% if no mesh is used. Your surgeon would probably have used a mesh.
Your symptoms are likely to subside in a few more months. The dissection during surgery for incisional hernia is rather large, therefore pain-like symptoms continue for a long time.