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Your symptoms are most likely due to gastroesophageal reflux disease, that is, acid reflux from the stomach to the food pipe in the chest. This happens more in the night hours which results in cough and sleep disturbances. Occasionally, it can also result in bad taste especially of undigested food particles at the rear end of the tongue.
This needs consistent lifestyle and diet modifications as well as medicines.
- Avoid heavy meals. Rather prefer small but short interval feeds.
- Avoid excess coffee, carbonated drinks, spicy foods and food items which can potentially relax the gastroesophageal sphincter.
- Avoid lying down or sleeping in a recumbent position immediately after having food. Rather have an early dinner and give an interval of one to two hours before you sleep.
- Keep the head end of the bed elevated (30 to 45 degrees) during sleep.
Regarding medicines, I suggest you add prokinetics like Domperidone (10 mg) or Ondansetron (8 mg) three times a day. You will need to continue this consistently for six weeks and see the response. I would like to have a look at your endoscopy report. You can send across the same when you review. Consider a review after four weeks.
I hope this helps.