I'll keep this short, so I can post quick since I am sure you want to see some advise.
I have had 2 c-sections. The longest my pain lasted was about 6 months, but that was sharp shooting pain, like feeling the tendons re-attaching. On a scale of 1 to 10, 10 being the worst, my pain after 2 months would have been a 3 or 4.
As for the diarrhea, that could be many ...