That is curious. I've been in practice about 25 years now, and am a diabetic myself, so the subject is dear to my heart. I've never heard of someone whose diabetes came and went. That is all very puzzling. It's well known that infections increase blood glucose. Perhaps that is part of what is going on with you.
LGB (both types) is for people who are severely obese and have not been able to lose the weight in spite of sincere efforts to diet and exercise. Guidelines call for a body mass index (BMI) of at least 40 if they have no other risk factors and the BMI requirement lowers to 35 if they do have a health problem such as diabetes, sleep apnea or hypertension that could improve if they lost a significant amount of weight. To put this in perspective, a BMI of 40 would be a 6 foot tall man who weighs 295 pounds. That same man would have a BMI of 35 if he weighed 258 pounds. The top normal weight for someone 6 feet tall is 184 pounds.
Either procedure limits the amount of food that can be put into the stomach at one time. Laparoscopic gastric banding involves slipping a band around the upper part of the stomach, creating a small pouch that can hold only a tiny amount of food (typically 1-2 tablespoons of baby food at a feeding to start). There is a variation of the procedure that uses a sleeve instead of a band, and still another variation that uses a band that can be adjusted by adding or subtracting saline.
Laparoscopic gastric bypass is a more complicated procedure. It is outlined here:
It generally results in more and faster weight loss.
If you aren't severely overweight, neither is indicated for diabetes treatment.
Please let me know if you need additional information about LGB.