Hello, You are stressed, have been diagnosed as depressive nature, you eat spicy food and smoke. I assume that your diet habits are irregular because of your work nature, which might have led to gastric ulcer. The drink you had is having carbonated water and citric acid. Both induce high acidity in the stomach causing severe crippling pain in the chest. You are very young, but as you have acidity you have to abide by certain instructions strictly for a long time (decided by the way you express your complaints) Frequent bland diet (Biscuits and not very hot diluted milk/plenty of water in between your regular meals instead of this acidic drink (these drinks can be used as stain remover) and a minimum of 7 to 8 hrs sleep/day is advised. A routine ECG if needed Avoid spicy food (fast food), hot drinks including alcohol, smoking, stress and depression in whatever way possible. Take Antacids, anti spasmodic and anti Flatulence (Anti Gas) + anti depressants (only if your Dr advises you considering your nature of work). If you take alcohol do one blood test called serum amylase and USG abdomen to rule out a condition called Pancreatitis (only if the your symptoms persists after treatment) If you change your attitude towards life and changing the life style you can recover totally. These changes you have to continue forever. All my very best wishes