Constipation, gas and cramping year after reversal surgery: Normal?

I had my sigmoid colon removed five years ago and had a colostomy bag for months. Reversal went well. Did not have problems with diarrhea. Have had constipation mostly since reversal. I also have IBS. I have daily cramping maybe from gas still to this day. Has anyone else had this problem. Not sure if it's normal for missing your sigmoid colon but very frustrating. I haven't went back to GI because he probably would tell me I have to have another cat scan which I've had too many already.