I have had IBS-like illness for ages but never had constipation in my life. In the past months, my digestive disease has become wild, with sudden stabbing pain in the epigastric region, huge bloating, extreme nausea, inability to breath, vasovagal reaction, diarrhea, hemorroids, vomiting and even three times passing out for syncope. Been to hospital emergencies three times already as I was just dying. They were insecure about the reason, suggesting gastritis for my awful diet, IBS, gallbladder disease (I have a huge stone there 3cm big)... but not certain. Amazing hell, happening more and more often. So I started a healthier diet, avoiding fats, sugars, meats, gluten, etc. It has got a bit better, but now I have constipation for the first time in my life. The rectum feels totally blocked. When I push I feel very dizzy. When I finally make it, it can be hard as stones. I sratrted drinking a lot and then I got a combination of hard (beginning) and diarrhea (final part). My hands feel super dehydrated, with wrinkles as if I had a hot bath. So, I went to my doctor and asked for Rifaximin prescriptions. She agreed and gave them to me. I still have to buy it. But now I have doubts because I read here that Rifaximin is only when you DON'T HAVE constipation. Do you know what I should do? Thanks.