I started doing it recently, and after each session I feel like I've been hit with an elephant tranquiliser, I need to just lie down and sleep. I've been getting headaches too. The only reason for this I can see is that the water must be stirring up stuff in my colon which is getting absorbed and causing these symptoms. If thats the case, then I'm fairly sure the stuff in the colon would have been causing some degree of these symptoms continuously. I've been doing this hydrotherapy every day (on my 5th day) and the days I don't get the symptoms are days I don't leave there with a pain in my stomach. In my experience, the pain happens when a wave of fecal matter is on its way, so I'm guessing the lingering pain is caused by partially dissolved fecal matter that I didn't get out. Has anyone else here tried hydrotherapy as a remedy for lethargy? My mood and mental clarity seem to be improving since I started doing it.