Stomach ache, sometimes it caused by “stress”. You should relax and take more sleep. Drink at least 8 glasses water a day. Healthy recipe:-
1 glass of milk boil with 1 teaspoon honey, drink it warm and take it before go to bed.
If you can control your mind, it helps your stomach ache. Sometimes physical pain is caused by continuously mental suffer. If you can release your mind in peace, take a deep breath and you can feel your body much relax.