question: About every 3 weeks but not regular I have these bouts of chronic sickness and loose bowels at the same time. It feels like that my body has to get rid of everything I have in it. It lasts for approximately half an hour which leaves me very tired and lathagic. The last time this happened I felt nausei all day and then in the evening the normal thing happened. I have had a colonoscopy. Can you help .?