Hi there,
Thanks for your question, yes I can help with your described issue.
As you described about 10 years old, I have studied your provided information and found only one remedy which can help him to restore his appetite for food.
A homeopathic remedy for picky eaters, you can try remedy Sulphur 30C.
Dose is let him chew 2 pellets of this remedy half an hour before breakfast and half an hour before lunch every day for next 21 days regularly.
I am so hopeful remedy will help well.
Kindly do not force him to eat any thing which he is not willing to eat, just let him use described remedy, with time remedy will complete its effects and he will be able to eat every thing as he was used to eat before.
You can arrange remedy from any near homeopathic pharmacy.
Let him use remedy as I described, as I am hoping for nice improvements.
Many prayers for his good health,
Regards,
Dr Zaheer.
(If you have any questions related to my answer then let me know, otherwise take a moment to rate my answer)