Hi welcome to hcm
You should go for upper GI Endoscopy
and RAPID UREASE TEST
to detect h.pylori infection.quadraple regimen of h.lylori kit should be taken for 21 days.6-8weeks after treatment go for rapid urease breath test
.AVoid spicy food.try tab.Razo instead of Nexium.If you have co existent hernia along with GERD symptoms like severe cough may present.take 3-4 litres of water everyday.avoid smoking
and alchohol as they are the risk factors for esophageal cancers.consult your treating doctor for further queries.