Watery diarrhea and fluetence for past 10 days in 4.5 years old

1. Watery diarrhea for past 1 week.
2. Half an hour after eating.
3. Not giving milk or oil or any fruits.
4. Cannot digest anything solid.
5. Pass smelly gases while on bed.
6. Very loud sound and gas pass while passing stool.
7. Very irritable and don't share things.
8. Head always sweat even with little play.
9. Start stomach cramps while eating.
10. Passes stool with little strain and loud gases.
Yellow stool only.
11. Get some relief with allopathic gas medicine but not permanent.
12. Have discomfort in bed so take time to sleep. Pass gases after lying down.
13. Navel displacement even after little jumping.
14. Don't like sweets.
Like egg, fried, salty and potatoes.
15. Weight good. Body structure fat.
16. Something food or whitish keep on coming in his mouth which he doesn't like..
May be it is bitter or sour.
17. He said pain in his stomach
18. I can feel sometging running like motor in his tummy when i put hand on his tummy.
19. His stomach is very bloated and big.
20. He had cough cold flu just before stomach problem.
It may be also stomach flu along with gastric issue.
21. No coating on tongue..but sides are red.
22. He do have sudden nausea sometimes.
23. His appetite is ok.
24. He is strong tendency to catch cold from slightest exposure to cold damp wind.
25. Doctor here suggested to stop his all milk product including curd as previously he was allergic to milk.
26. So diagnosis was it could be stomach flu or gastritis or sudden milk intolerance as well.

Plz help