For the past few months I have had IBs whihc is usually constipation, bloating and tightening pain in my lower stomach. For the past month, I have been getting bad bouts of nausea that almost make me vomit. It is sometimes eased through belching, but normally passes in about 10 minutes or so. I know it likely stems from my IBS, but I just need to know if this is common and what you can suggest is my best method of getting better. I have never been treated for my IBS, and need to know if it's just medicine or if there's tests you need to take etc. Thanks.