Try reading this recent report about IBS http://www.sciencedaily.com/releases/2012/05/120525103354.htm
If you have symptoms in your small intestines (bloating, pain etc), it’s pretty likely SIBO is the problem. Symptoms soon after eating suggest the same too. GERD and a history of acid suppressing drug use are big contributors to the problem. You’ll probably have lots of food sensitivities too, since leaky gut is almost guaranteed.
It’s important to make the distinction, because you need to alter your diet to treat bacterial problems. Ketosis isn’t generally a favourable state to be in, and not helpful with candida, since fungi can feed on ketones. Bacteria, on the other hand, rely on glucose, so a near zero-carb diet and regular fasting is much more effective. Eating lots of coconut oil and additional protein can help prevent a glucose deficiency. If you feel the need, it’s possible to maintain ketosis even while consuming some carbs if you eat lots of coconut oil.
Daily intermittent fasting is a good practice to follow. You set an 8-hour eating window, e.g. 9am-5pm, and fast for the rest of the day. Towards the end of the fasting period, your body begins autophagy, which can destroy intracellular pathogens. A weekly 36-hour fast is helpful in the same way, and any kind of fasting obviously helps to starve bacteria. You can eat coconut oil without breaking your fast.
You should read through the biofilms thread too. Once microbes multiply to the extent that quorum sensing becomes possible, biofilms are an inevitability. I think this is much more an issue for people with SIBO than candida, and probably a big factor in so many people struggling with the condition. Biofilms essentially make bacteria impervious to antibiotics, so they need to be dealt with as a priority or you’ll never fully remove the colonies.
I’m not an expert on the condition and haven’t researched it specifically, but I’d definitely try a near-zero-carb diet with minimal fibre, including intermittent fasting and weekly extended fasts. At some point, you should attempt to disrupt biofilms for about 4-weeks by following one of the protocols mentioned in the thread, which involves special supplements followed up with antimicrobials to eliminate the disrupted bacterial colonies. I’m sure you’ll get a better picture if you do some more research on SIBO around these lines. Good luck anyways.