My one and half year old son very weak.he was fine till 6 month but after this always weak ,sudden fever , constipation, diarrhea,,after 9 month he found inlingual hernia,and operated but after this again weak.sudden night fever,constipation,weakness,no hunger,very low weight,I consult good doctors but no relief.i tested allergy and
thyroid but all. normal.plz suggest.