My husband has been feeling ill for about nine + months. At one time the doctor thought he might have pancreatitis but that didn t get any worse. He lost weight down to l35 at slight frame and 6 ft tall. He gained up to 155 but is losing weight again. Blood work up really didn t show much. He has no energy, is now on oxygen at night which seemed to help a bit, gets dizzy when he has been sitting and gets up or when he drives the car and then gets out of the car he usually gets dizzy. A few times he has fallen during a dizzy spell. I would like to have a complete workup but I don t know what kind of doctor I should call. Our GP doesn t seem to take it too seriously.