I know what you are talking about. I was battling candida for several month and I progressed to get worse and worse. I then got hand on a book dealing with the different types of IBS, there I learned about SIBO and bacterial overgrowth.
Suddenly things started to make sense to me. The MD didnt find BAD bacteria but what they dont know about is that you can have too much of the good on wrong places. I then wondered how the high fibre diet is affecting me. I had diarrhoea, very fast transit and all candida sympthoms you can thing of. In the end I was suffering panic attacks and nervous breakdowns of my entire system. I never had this happening to me in my entire life.
I then stopped with the candida diet.
I stopped eating high fibre food.
My diarrhoea stopped after one day. Brain-fog I had for nearly a year vanished too. Pains stopped etc. Not to constipate I eat linseeds in my food. These don’t ferment and are NO food for bacteria. I still suffer but I am 80 percent better. I believe that I might have too little acid and are not digesting proper and have problems from there or I am straight forward intolerant too some food or the amount taken.
I too noticed that not eating after 20.00 hours until morning 8.00 is a very good thing. In the night the guts are not operating and food being there is fermenting. So the best is to give a natural time of rest to the guts.
I am not taking pro-biotics as I reacted to them but I am doing myself a drink from fermented cabbage. I run the cabbage through a food processor and add a lot of water, then I let the cabbage water mix standing for three days and drink the drink over a day. Then I set up a new one. Its doing me very good.
For constipation is good to learn to sit right on the toilet. Its good not to hang over your legs but sitt straight up. It make a big difference as I was always sitting bend over.