According to above mentioned history, as you are in recovery period, You need to give time for your body to recover, healthy habits and lifestyle modification with some simple changes you will be able to overcome this in future such as..
1.Avoid or limit consuming spicy food for few days.
2.Avoid consuming coffee or tea empty stomach incase you are doing so.
3. Limit consumption of alcohol and smoking if u do so.
4. Try eating meals at correct time. Avodi skipping meals.
5. Drink plenty of water minimum 3-4L in a day according to your weight.
6. Trying improving your sleep schedule. Mininum of 7-8hr.
Next Steps
If u are facing problem with other foods such as barely, rye, oats, wheat then further evaluation need to be done.
If even after following the above mentioned things, no change is observed consult a doctor.