Hi, sorry I missed your posts on the gastric band thread, and I've been looking at your other posts as well.
One of the many side effects of the surgery is blood glucose levels seem to have a rollercoaster ride.
There are theories why, it does.
You have had the trials of drugs. But not full control of your blood glucose levels.
When you eat because of the surgery, the response from the hormones, for instance insulin isn't enough to cope with the glucose . Because of the surgery, you have become insulin sensitive, insulin resistance with the T2, and also something called gastric dumping or glucose dumping
Usually, the higher glucose will come back to normal levels, but some people stay higher or go hypo. It all depends on your hormonal response or the amount of insulin you can use due to insulin resistance.
If Sitagliptin doesn't work, which is by design to increase insulin response and lower the glucose dumping blood glucose levels. I would presume that other drugs will not have much effect.
You have become carbs intolerant, I would recommend a keto diet.
Your fasting levels are decent, in fact I would presume near normal or just prediabetic levels which means that the su every has reduced the T2 levels. But every time you even eat low carb, you spike high.
I can answer some questions, as there has been those who have had surgery, have had similar symptoms to Reactive Hypoglycaemia. But in your case it is not quite clear. Mainly because of the drugs. I wonder what your levels would be if not on meds, overall. And yes hypos are bad!