I was lucky because when I had my rectum removed and was sewn up,I hardly had any discomfort at all.It did feel slightly strange, like a tightness for a few months but it wasnt painful. I had pain where my stomach had been
opened up for the second time though. I realy dont know why it is taking so long for your pain to subside. I suppose it is possable that its just a case of everyone is different and some people just take longer to heal than others do.
Sorry that I cant be of anymore help.