I just got diagnosed with IBS about 3 weeks ago and my doctor started me with Zelnorm. In the past 3 weeks, I've changed my diet dramatically and I noticed that I've lost quite a few pounds of weight. I'm also feeling tired and sort of depressed. Does this happens normally? Coincedentally, I also have Acic Reflux and the diet program is somewhat similar to IBS diet program. I welcome your thoughts on this.John L.