I finally knew the answer !
Referring to this post, now I know what happened to XJ. Few days ago, my girl complained of stomachache. Coincidentally, she had slight fever and the first thought came into my mind was 'APPENDICITIS'. After our dinner, I brought her to the clinic for a check-up.
Found out, she was actually having a throat infections and that's contributed to the mild fever. I told doctor that she also complaint of stomachache very often and what could be the problems.
Doctor analyzed her daily meal times and suggested that she might be having gastric. XJ had her dinner quite early in the evening. That will be around 6pm. If she was too tired, she will sleeps at 8pm. Before bedtime, she did not drink any milk or have any light supper. So, her dinner might not be sufficient to last her till the next morning. She wakes up at 6.30 am every morning but by that time, she already had stomach upset.
Due to her stomach upsets in the morning, she rejected breakfast and all the while, I thought it was wind. I applied ointment but that doesn't solved the problems. There were even a period of time where she would vomited her milk after drinking only a few mouthfuls.
Doctor suggested to make sure she takes some light supper before bedtime and breakfast is a must. She must take care of her stomach to avoid gastric attack so it won't mess with her daily meals. Doctor prescribed some gastric medications for her and luckily XJ don't have any problem gulping them down. So far, she no longer complained of stomach aches and I must make sure her stomach is always filled up.