You made a good call by eating the banana. You are right, your blood sugar is low and fixing a low blood sugar is more important then any bacterial overgrowth. You might have done this already, but I do recommend contacting your doctor. Low blood sugar is a very good reason to call an emergency line as well.

If you experience a low blood sugar again, putting something sugary in your mouth is important as well. Drinking some syrup and put some honey in your cheek. 

Is it possible for you to warn someone at home when this happens or do you live alone?

Gastroparesis can lead to low blood sugars. The delayed emptying in the stomach can cause this. Did this happen before with you?

I know there are no real clear signs of insulin resistance going on in your lab results, although I do believe that right now if there is insulin resistance causing some issues it will be hard to spot.

– it will be hard to see it reflected in blood sugars since eating in general is a problem.
– it will be hard to see it reflected in HbA1c since blood sugar might be low.
– still there might be a disturbed insulin signaling as a reaction to eating a meal.

Having a functional test for insulin by measuring insulin 1, 2 and 3 hours after eating a carbohydrate containing meal might provide you insight in what is happening with insulin. Measure your glucose levels as well at those points. Since gastric emptying is slowed you might even want to check 4 hours later or longer since I don’t exactly know how long the delayed emptying is. 

 you might want to look into the Elemental diet and find a naturopathic physician to work with you closely. 

 since you are very sensitive at this stage, and have many food restrictions, the elemental diet (medical food powder) is another option designed for those struggling from SIBO. It can offer relief while gut healing/supporting digestion, and gut immunity. Click on the link I shared above to learn more about it.

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An elemental diet is a diet consisting of pre-digested nutrients designed to be a sole source of nutrition for limited periods (generally for 14-21 days). The nutrients of an elemental diet are in their simplest form, allowing them to be easily assimilated by the body while allowing the gut to rest.

So it doesn’t contain proteins but amino acids (16-18% of the calorie intake)
It only contains monosaccharides (42-76% of the calorie intake) and it only has fatty acids (between 6-43% of the calorie intake).

So yes, it is a supplement, but it’s also food. Or more accurately, this is a medical food.

You have probably already seen it, but just in case: I attached an e-book which has more information
.[elemental-diet-clinical-applications-protocols.pdf]