20 years ago I was told normal BGL was 80-120 no i am told it is 70-110. I have post gastric bypass hypoglycemia. I start feeling very tired at around 65-70, less then 65 i start getting chest pain, sweaty,at this point i can usually still help myself,but below 60 mild trembling, lightheaded, eventually i start uncontrolable shaking then passing out. years ago it has gone into the 20's. The past few weeks it has returned, the lowest reading I have is 54,(at the docs' office at the end of a 2 hour glucose tolerance test) but know it has been lower, family and friends know to give me juice or a glucose tablet when i exhibit certian symptoms, by the time my sugar is checked after that it is within normal range.