hi i had gone through your query and understand your concerns. i would come up with two most possibilities to fit your condition .these include
1.first possibility of DIABETES;check your blood sugar levels on fasting and post pardinal.
2.second possibility is,APD ACID PEPSIC DYSPEPSIA
possible causes include;
irregular dietary habits,
-EXCESSIVE USE OF PAIN KILLERS,ANTIBIOTICS,STEROIDS
for even minor complaints,
-CURRY,HURRY,and NIGHT WATCHING,
-SUPPRESSED STRONG EMOTIONS are the main causative factors.
I hope this is helpful for you, thank you