Hello
Welcome to healthcare magic
Nausea with chest pain after eating food,lump in throat may be due to gastroesophageal disease with gastritis( peptic /
duodenal ulcer) with or without H.pylori infection.
You need to visit gastroenterologist for further management .
If I were your treating doctor,I would recommend,
-Investigations like upper GI endoscopy and x ray oesophagus with
barium meal.It will help in confirmation of diagnosis and assessing the severity.surgical option can be considered.
-PPIs like omeprazole once a day for atleast a month for
acid reflux.Antibiotics need to be added like
clarithromycin and
metronidazole if H.pylori infection found.
-Avoid excaberating factors like alcohol,caffeine,hot,spicy food,NSAIDs,aspirin.
-Have a gap of atleast 3 hours after last meal before going to bed.Sleep with head elevation .
-Avoid stress.
Hope this information helps .
Wish you good health.