So are you being treated for gastroparesis? The IBS can be a symptom of Candida, I have that too. Except I started taking psyllium husks and it has REALLY helped. I would really recommend doing the detox drink in the cleanse stage of the diet even if you can’t stomach the cleanse itself. It’s made with psyllium husks and betonite clay which is really good at clearing out toxins so it could be a big help. The psyllium husks also help with diarrhea as it binds everything together.
I think there is a possibility your pain is caused by the bacteria and if it is, doing this diet will help a lot. I would also suggest some liver support such as milk thistle. The liver contributes a lot to the digestive process so I would try everything possible if I was having the problems you are. Acid build up could be to do with your liver not functioning properly. Are you vomiting at all?
Have a look at this link: http://liver-disease-symptoms.com/. This will help determine if your pain could be related to your liver under performing. As far as I can tell, an endoscopy doesn’t directly check your liver so this is something doctors could have missed. I could be wrong though.
As for probiotics, Threelac has a good reputation and is specifically designed to kill Candida. It also has a 60 day money back guarantee.
Also, do you have other symptoms of Candida? And what other foods are you eating? You mentioned chocolate…I assume that’s cocoa powder? That isn’t allowed on the diet because of the caffeine content which feeds the Candida. So if you definitely have bacterial overgrowth you’ve got to eat all the foods that kill it off and stick it out through the die off.