hello, welcome to healthcare magic from the symptoms you have mentioned, it is one of dangers of gastric bypass surgery it is called hyperinsulinemic hypoglycemia - this occur a year and two after the procedure, symptoms are caused due to increased insulin secretion which result in tremors,palpitation,sweating,hunger or anxiety,fatigue,confusion,seizures and loss of consciousness. these occur 1 to3 hrs after meals and increase in frequency and severity as time moves on treatment is usually eating small frequent meals consisting of vegetables, whole grains, proteins and fat. in severe cases hospitalization is necessary with tube feedings. in life threatening cases reverse the bypass or removal part of pancreas to reduce the increased insulin production. would suggest visit a specialist for review hope to have answered your query get well soon.