Welcome to HealingWell!
I'm sorry to tell you this, but most likely the irrigation will not fix your problem. It may improve it for the 1st week or so, but it isn't the end-all to your problem. Additionally, colon cleansing can be dangerous -- please make sure you are being monitored by a physician at all times. (You will find MANY people on this site, along with many docs, who do not approve of colon cleansing.) I hope you did your research before opting for this.
Have you tried adding prune juice or fiber to your diet along with lots of water? Have you spoken to your doc about
Zelnorm? Aloe vera has also been known to be a natural and safe laxative.