xifaxan

New to this site. Ran across it looking up this antibiotic. My story is too long to go into but been having stomach issues (upset, bloating, nausea, no vomiting), etc. actually all this started over 4 years ago with chorionic dry mouth and throat. Been to numerous doctors and had every test and biopsies done.
Anyway, went to a new GI doctor due to the stomach issues that just about have taken over my life. I actually wake up clammy and sweating and with an upset stomach before I am even out of bed. He prescribed Omeprazole (another story) then generic Levsin, then Dicyclomine and Zofran. Then tried adding low dose Nortryptoline then I was really feeling sick so stopped the Nortryptoline. He fphas done endoscopy, CT scans, MRI, stool specimens, etc. he thinks I have IBS. I am not too sure about that. Let me add that I have problems with a lot of medications. Dicyclomine was making my mouth abpnd throat drier so he told me to go back to Kevsin. I was only taking 1/2 a pill. Monday, noticed I had an irregipukar heartbeat, no pain, continued into Tuesday and that night. Finally went to ER and they tested, etc. ER doc said it was probably the Kevsin and to stop that and the Dicyclomine. I will now have to do a 24- hr halter monitor but palpitation seem to have stopped. In the mean time, I had that hydrogen breath test (?) done on Monday. Nurse called to say I do have bacterial overgrowth in the small bowel. Well, at least they found something. doctor prescribed 550 mg Xifaxan twice a day. My God, thank goodness he gave me samples. Cannot believe the cost!!!!!! Finally got up the nerve to start it this morning. No bad side effects but have been queezy all day but not sure from what and now I have nothing here I can take since they stopped the other meds. I do have Zofran but am only to use that when absolutely necessary. I am soooooo hoping this will work and maybe I can get back to some normalcy instead of spending most days feeling sick and laying don my bed most of the time.
So my questions are:
Anyone else wake up feeling sick before even getting out of bed?
Anyone have experience with this drug, good or bad?
Any ideas what I can use for this nauseated feeling all the time?
From what I have read about IBS people usually suffer from constipation, diarrhea or frequent bowel movements, which I really don't on a regular basis. People seems to have episodes, not daily symptoms like I do.
Should I be taking some type of probiotic with this? I actually tried one from the pharmacy a few weeks ago and felt worse!
Thanks