Anyone getting tachycardia with sugars of 5.2 should probably have their potassium channel genes analyzed because , insulin LOWERS potassium and this causes the arhythmias as well as the ACTH and epinephrine response to the drop of sugar levels.
atrial fibrillation can have adverse events and you should LOOK AT YOUR GTT test more carefully . do you have an increase of INSULIN in response to eating sugar, ? IF so GET YOUR POTASSIUM GENES ANALYZED.
high insulin spikes after sugar indicate this problem and it is NOT insulin resistance.
I have precisely the same issue. I have had a history of PVCs and AFIB as well as Tachycardia so I am familiar with the symptoms. I am also a Type II Diabetic. I take Metformin 1000 mg twice a day and Glyburide 5 mg in the AM and 2.5 in the PM. Sometimes the Glyburide lowers my blood sugar too much particularly if I don't eat something a few hours after taking my meds. As you mention my blood sugar will only be in the 80-90 range and I start to experience hypoglycemic symptoms. Fatique, palpitations, sweating, shaking, feeling of dread...just a general awful feeling. Mnay times I do have a racing heart and a rate of 120-160 BPM is common. They are also very hard and forceful beats and a bit scary. As soon as I take in some sugar (I have some glucose tablets but if they are not handy I drink a sugared soda or juice) I feel better in a few minutes though I sometimes have some fatigue and a headache after. I know the conventional wisdom is that your blood sugar has to get down to 60 or below to be really hypoglycemic but that is not the case with me at all. 80 or below and I am off to the races. I read in one article that some people can have an "adrenal" response to rapidly lowering blood sugar that mimics hypoglycemia and that may be it thought I can't find a lot about this. So don't feel unique. We are in the same boat.