How often do i need to have symptoms of hypoglycemic attack to be considered hypoglycemic? negative for diabetes what else could cause this?

You don't have it: In addition, in my 35 years of practice, I have never seen a case of reactive hypoglycemia. The disorder doesn't exist, if you're overweight the symptoms are a natural response to you sugar returning to normal. A glucose tolerance test (if you've had one) is not and never will be a valid diagnostic test for hypoglycemia. Low glucose only ocurrs when treating diabetes, cancer, renal/liver disease.