Thanks for posting.
Depending on the location of the chest pain (if retrosternal or slightly above epigastrium), then it might be oesophagitis ( inflammation of oesophagus) or possibly but less probably peptic ulcer diseases. In either case you might require another antibiotics such as ciprofloxacin
or combination of amoxicillin + clarithromycin
plus a protein pump inhibitor such as omeprazole to cure the affection.
If you do not feel any better, then you will need to consult a gastroenterologist
. An endoscopy might be requested to determine the actual cause of your odynophagia (painful swallowing).
Hope this was helpful