My gallbladder was removed June of 2011. My first bowel movement, two days after surgery, was horrible, I almost fainted even though I was taking Colace. For a couple of days I felt an intense pain as if I was having a gallbladder attack. Ever since surgery I have urgent watery bowel movements. At times I see the fat floating and undigested food. It is only getting worse. My stool has a very bad smell, as if I had some sort of infection. What also concerns me is the fact that I get anxious at times before a bowel movement. Most of the time I get weak and lightheaded before a bowel movement. I followed up with the surgeon twice and he did blood work and an ultrasound and everything was normal. I also get a lot of acid reflux now and nausea. What can be causing this?