Irregular UpperAbdomenPain post ViralFev

I had viral fever with throat infection from 1st sept which was cured after 4-5 days(Took OpexCV & AcecloPlus with Pan40). After 1 week on 14th sept I had stomach pain with 2 normal motions which got cured in 2-3days(Took Metrogyl400 thrice and Darolac). However I had stomach pain on 19th, 23rd and 29th sept which was cured after taking 1 Drotin DS. I had also taken Unobiotics for 7 days.Other days there were no issues at all. My sleep is disturbed almost everyday from  4 or 5am hence I cannot sleep properly after that due to stomach discomfort. So I am taking Esomerprazole 40mg from 3 4 days. I have been eating home cooked veg food from last 1 month though I am non veg. Drinking boiled water. The pain is mild in the upper abdomen region just below the chest. No fever. Please can u guide what can be the issue and further steps to follow.I am worried why the pain keeps coming back after 5 6 days and then completely cures.