burning on left side after c-section?

I had a second c-section last monday and am having a harder time recovering than I did the first time. I felt better faster this time and wasn't sick from the spinal but I am not getting around as well as I did last time due to a constant and painful burning in the left side from the internal incision. The doc says it is because I wasn't doing enough and I've tried to do more but it's really painful. I'm taking vicoden but that only seems to last about 2 hours and advil is not helping. Has anyone else experienced this? If so, how long was your recovery and was there anything else you did to help yourself heal faster?