Do you mean fullness or bloating? That will need a medication like itopride. As for the GERD, with hiatus hernia, this will need further tests in the form of 1. Manometry 2. 24 hour pH. If these show the severity then a surgery will be needed: the hiatus hernia which is the cause of GERD can be repaired laparoscopic or robotic way and that will give you long term relief.

GERD with hiatus hernia with esophagitis warrants either long term treatment with PPI or a one time definitive surgery in the form of Fundoplication(a better option considering esophagitis). Bloating may be because of the antibiotic component of HP kit.

HP kits contain antibiotics in higher than usual dosage since H pylori is a resistant bacteria. It also contain PPIs that are basically antacids. It’s common to have some form of bloating belching after this. If it’s severe, consult the doctor again