I'm a type 2 diabetic in remission (hba1c of 33 for over 2.5 years) who developed reactive hypoglycemia 9 months post gastric bypass surgery. Super difficult to manage but this is what I've learned thus far:
My body does not like carbs, especially sugar, alcohol, white flour based products, potatoes, pasta, rice, legumes, some fruits and most of the complex carbs. My bsl will rapidly spike (food going from bypass tummy directly to lower intestine rather quickly) then my pancreas goes stupid in response to the spikes, throws out way more insulin than is required, then 90 minutes post meal, I'm just about passing out with low blood sugar.
If i eliminate carbs completely, I stop the food related hyper-hypo cycle, but then I become hypoglycemic all night long when fasting or in response to exercise because there is no glucagon stored in the liver, to get bsl back up to normal when it starts to drop. This actually felt worse than the carb-related hyper-hypo events
So it's kind of a damned if I do and damned if I don't situation. I now eat 6 meals. 3 of them I have a small amount of carbs alongside 100mg of acarbose to try and stop the spike - the theory being if we prevent the spikes, we prevent the crash, but I've found this to be a bit hit and miss, and what works one day, doesn't always work the next.
The next they've done is added in a low dose (0.6) of GLP1 - liraglutide each day. The mechanism of action I'm not entirely sure about, but I'm assuming as glp1 is the hormone that controls insulin and glucagon response somehow it must help the body to regulate these better, and for the past 6 weeks the number of hypos has been significantly less. It was normal some days for me to have 2-3 events or when carb-cutting to spend 6-8 hours of the night/day in a hypoglycemic state. I now might get 2 or 3 symptomatic lows per week, and I've been able to stop the continuous glucose monitoring.
Anyway just wanted to share my experience. I'm in NZ and the so-called specialists - bariatrics and endocrinology have been pretty useless as far as trying to get this sorted for me. I don't think anybody really understands the mechanisms of post gastric surgery hypoglycemia and it's all a bit hit and miss. I do wonder if being type 2 pre surgery was a factor.
I'm taking this from what I have read in my exploration of RH and similar conditions.
The RH from your operation is quite common after surgery, more than RH from other reasons and of course .it's research because of it, is being done.
What is happening is called glucose dumping, and the reason behind the acerbose to try and slow down carb absorption. But as I have found out it is very indifferent if it works at all. In my opinion, better drugs may help, but with my rh, it is only a complete change in diet.
Carbs have me as well. I have classed myself as carb intolerant.
And until I started keto or staying in normal levels continuously did I notice the hypos stopping.
But unlike yourself, fasting is really good for me. I have never gone hypo fasting.
I'm assuming that the hypos while fasting also happened before the surgery?
I know from my experience that, when you eat any carbs, that starts the rollercoaster ride of high and low BG levels. And doesn't stop until your BG levels settle down or maybe through sleep.
And it does seem that like me, you have since then have an overactive pancreas. The signals from brain to your organs, are not helping by any means.
The six small meals a day for me didn't work. I have heard of this, and to me, and my condition doesn't make sense.
Apparently, according to my endocrinologist. It is a common misconception that having meals every three hours stops the hypos and provides surplus glucose for good brain function. Because of carbs and glucose derived from carbs for energy, but I get better energy levels without carbs.
However, it doesn't stop the rollercoaster ride of BG levels, so you are still experiencing the symptoms.
And it doesn't stop the hypos if you miss a meal????
Also being intolerant, should mean to be avoiding them, just as I am lactose intolerant and told to stay away from dairy. It is not logic if you are intolerant to wheat, starch, grains etc??
I only eat fresh food, cooked at home. No manufacturing processed foods, and no vegetable oils, palm oils etc. Only good saturated fats.
Then I know what is going into my stomach.
With my RH, no carbs, no high spikes, no overshoot of insulin, no hypos, no symptoms.
I hope, I have given you some thought about your situation.
And I have met and seen many doctors and endocrinologist who have no idea whatsoever about the science around reactive hypoglycaemia.
And how much your future health depends on control of your BG levels.
Most of them just use the text books, which are totally wrong and damaging to your health.
Best wishes