I'm Tamra. I have fibro, CFIDS, IBS, depression, insomnia, thyroid nodules, joint and all over body pain, etc... Had fibro pain, migraines and insomnia since 1995, but got really, REALLY sick since having a very bad intestinal infection (c. diff) in July of 07. I posted on another forum a while back wondering about the antibiotic Rifaximin, and someone on that group, louella m, wrote and told me someone named Shane in this group had tried it. I'm wondering if it helped at all. I'm seeing Dr. Linda Nguyen at Stanford on May 20. She's a GI motility specialist and will be doing a lactulose breath test to see if I have SIBO. If I do, I need to decide if I want to risk taking an antibiotic like Rifaximin, since taking antibiotics is what got me into this mess in 2007. Does anyone here have experience with Rifaximin for SIBO or any other condition, and if so what is your opinion? Thanks!