I had c-sections with both of my boys and I remember something similar to what you are describing with both boys. During the abdominal surgery certain small nerve fibers are bound to get severed or at least bruised. I went in several times to find out why it felt like my abdomen was burning or being stabbed and they explained it to me to the best of their ability. They basically said that there will be a lot of weird and possibly painful sensations as the nerves begin to "wake up" and heal. Unfortunately it is possible to have these sensations for quite a while post surgery but they should get less and less painful within the next few weeks. I hope that you are experiencing the same problem that I did and that it is nothing more serious