I think a Colon Cleanse is a good idea to move out any remaining gunk in the system but i dont think its totally surprising that you may feel worse after a flush. Considering the stress of doing it in and of itself as well as the toxins getting moved out and around your liver, sometimes it may be an overload.
Dr Hulda Clark says that if you feel worse after a flush its probably stones from the back of your liver moving up to the front. It will make you feel like crap but its necessary to get through it in irder to rid yourself of the problems all together.