There is a condition called Small Intestinal Bacterial Overgrowth that fits this description. There is even an antibiotic that is marketed toward and prescribed for the condition called Xifaxan / rifaximin. Neomycin (another antiobiotic) is also used to treat it.

This research lab is studying it and this doctor (Pimentel) has written a book about it: http://www.cedars-sinai.edu/Research/Research-Labs/Pimentel-...

That is interesting. In my case, I was on two courses of antibiotics (a 7-day course and a 10-day course) during which I did not see improvement or use probiotics.

It's only when I started the 30-day course that my doctor told me about probiotics. I started the probiotics at the same time as the 30-day course and saw immediate improvement.

Perhaps my problems were caused by a lack of beneficial bacteria while your troubles were caused by some type of infection? Or maybe it was only the 3rd antibiotic that cleared something out of my system?

I've done this as well. A one week course produces a marked improvement.