I am sorry to hear that you aren't feeling well. I recently bought a used copy of "The French Diet" by Michel Montignac. In that he has a chart on the glycemic index of over 100 foods. Beer is the highest and some green vegetable is the lowest.
The reason why you may be getting a different G.I. for bananas is he recommends eating bananas before they are fully ripe, like when they have tinges of green on them because that is when their G.I. is the lowest. As fruit ripens the fructose in them rises. Therefore, when you eat a really ripe banana it will have a higher G.I. because the fruit has ripened to the point where the fructose in it is higher. The higher the G.I. the more it will affect your blood sugar.
Having said that, until you can see your doctor, if it were me, I would not eat much fruit and I would certainly stay away from oranges, orange juice, bananas and/or dried fruit like raisins. I am going to send my mom a copy of that chart because she is diabetic and she has to count her carbs. If you aren't too sick and can get out, the library should have a couple good copies of some carb counters or a book on diabetes that discusses it. I am NOT saying that you have diabetes but just that those who do also have these same concerns.
You have probably heard about "good carbs vs bad carbs"? Well, this is what they are refering to. You want to avoid white sugar, white flour, processed foods because they all spike your blood sugar rapidly. It also creates that up and down feeling you get when your blood sugar crashes a few hours later.
I recently made the mistake of having several pieces of fudge and within a matter of hours I felt sick like you are describing. Once, I ate a meal of low carb/high protein a few hours later that night, my body felt at an equilibrium. It startled me because I had not had a reaction like that in a long time. I think it was, and this could be in your case as well, that once you start eating healthy (ie;detoxing) like I am assuming you are doing right now that when you do go off your "plan", this is a quick reminder of just how those things we "used" to eat did affect us but we had built up such a tolerance we didn't pay attention. Back then, when you were eating unhealthy, more than likely because you "cycled" with your food intake, eating more or more frequently (ie; feeling constantly hungry) all this kept kicking it back and forth--high low high,etc.
Good carbs slowly release sugar into your blood stream and therefore do not have this same marked effect. Eating good carbs consistently is a good and effective way of stabilizing your blood sugar so that you won't be having this wide swings of insulin. If you do this to your body long enough, it can become insulin-resistant, which is what diabetes primarily is. My mom has that and since I have a family history on both sides of diabetes I am deciding that some foods are off limits whether I am on a diet or not. I do NOT want diabetes. I'm sure you don't either. A healthy diet can "fix" pre-diabetes. A healthy diet can keep diabetes in check if you are diagnosed with it.
You didn't mention what kinds of foods you are eating but right now until you can see your doctor I would avoid the foods I mentioned above. Stick with green vegetables and a minimum of fruits. Do NOT eat anything "white", as it has been said.
I think once you correct your diet all of your symptoms will go away.
Remember we are what we eat! Good luck and hope you are feeling better.
Glycemic Index???
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