Diagnostic Testing Denver 24 Hour Esophageal Impedance pH Test Bravo Capsule Esophageal pH Test Cine Esophagram Esophagogastroduodenoscopy or Upper GI Endoscopy (EGD) High Resolution Impedance Manometry (HRIM or Esophageal) SmartPill and Solid Gastric Emptying (SGE) Study