The pain or full feeling that you have near your belly button to the left is probably over the splenic flexure. Unfortunately, things can get stuck there so to speak, as it is the flexure between the transverse colon becoming the descending colon, that then goes into the rectum and anus.
Do you have pain and feel unwell generally? If so, you could be having a diverticulitis attack.
The colonic could not have caused this as it is perfectly safe to have this procedure done with diverticulosis, but not when you have a full blown attack of diverticulitis. If there were any problems, then your practitioner should not have continued. Also, the speculum only goes into the anus and you lie on your left side when this is being done to avoid injury, as this is the way the bowel runs. Also, your bowel is only cleaned with water and if your practitioner uses an up to date machine, he/she can monitor the pressures and let water in an out as needed after massaging your belly to losten all the debris.
Try not to worry too much about it, it is probably related to something else and not the colonic, unless you have a practitioner that does not have a clue what they are doing.
Hope this helps and take care?