Hi, and welcome!
I just wanted to add to Stephie's post that this has been discussed twice, just last week, on the IBS Diet board. Do a search on colon cleanses or colonics. Unfortunatley, a lot of the people who are performing this type of treatment claim that it will cure IBS. Well, there is no cure for IBS since experts in the field don't even know if there's an organic cause. There have been no studies done that prove colonics/cleansings are beneficial to one's health, instead risks include aggravation of IBS symptoms, perforation, trauma to your digestive tract, and pain.
If you do a search, you'll also find people's personal stories about going through the procedure. Doesn't sound safe or fun!
Sorry to sound so negative, but I just want people to realize this isn't a necessarily safe procedure. This site and the boards offer a lot of useful information and ways to manage IBS that aren't invasive or risky.