Hello,
You have symptoms of Gastritis with repeated episodes of cough, could be ? Reflux or allergic.
As you say you have gastritis but you are consuming acidic food & soda, not advisable.
It's better to get the gastritis evaluated.
Gastritis - is a general terminology, it has to be diagnosed with an endoscope & other causes need to be ruled out.
Next Steps
Visit a General Surgeon for assessment.
Health Tips
Avoid heavy meals, spicy food or cold drinks.