Many times after viral infection die to antibiotics effect Gut if kids is disturbed give him plain gyrpe water plain buttermilk to react with gut as probiotics reduced give him curd rice

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Give him a punch of dadimashtak churan with honey/ leukwarm water You can use gripewwater or harad for his digestion

Please see a pediatrician

Many times, after taking viral medicine, such symptoms are seen. You should consult a pediatrician. In Ayurvedic medicine, you can give 5 ml of Balachaturbhadrika syrup in the morning and evening for 5 days.

It seems like hes having excessive pittaja increase due to the viral infection and the antibiotics given to him has led to the side effects so you shouldn't worry about it. Sometimes due to obstructed cough in baby also causes less bowels. You can start improving his immunity by giving him suvarnprasha.

This is most common symptoms while recovering from viral , so that just give him easy to digest food like khichdi and Don't be afraid...

The symptoms described in your son's case—reduced appetite after viral illness, vomiting, occasional back pain, gas, and some coughing—are not uncommon in children recovering from viral infections. Post-viral fatigue and appetite loss can linger due to the body's energy being focused on recovery, and digestive issues might arise from the viral impact or medication use. Vomiting may indicate ongoing mild irritation or digestive upset, and occasional back pain can sometimes be related to viral myositis, a mild muscle pain condition after viral infections. The coughing, if mild, could be a residual post-viral cough which typically resolves gradually. Key points to consider: Loss of appetite after viral illness is common and usually temporary. Ensure hydration with small sips of fluids. Offer bland, easy-to-digest foods in small but frequent amounts. Monitor for signs of dehydration or worsening symptoms. Back pain post viral infection can rarely be viral myositis, which is usually self-limiting. Mild cough after viral infection can persist for weeks without severe complications. However, because your son is vomiting and complains of back pain, it is important to monitor carefully. If vomiting is persistent, if he shows signs of dehydration (less urination, dry mouth, lethargy), or if back pain worsens or is severe, seek medical care promptly. Also, sudden severe abdominal pain or changes in bowel pattern despite normal stools may warrant evaluation. In summary, your son's symptoms could be part of a normal post-viral recovery phase involving appetite loss, mild digestive disturbance, and residual cough. Supportive care with hydration, gentle nutrition, and symptom monitoring is key. If symptoms worsen or fail to improve, prompt clinical evaluation is necessary.

Don’t be panic or afraid , give him some warm sweet lime juice or orange juice with some rock salt you can also use lemon and salt to change his tongue taste , it will take couple of days to get him back to normal

Jeera,hing, ajvain,blacksalt has good result

Thanks for your Q, Ayurvedic approach for complete fever management ends with Virachan then Rasayan therapy medicine. But as ur kid is just 3ys so just Manuka i.e. trifala with Dried Rasins is good in that sense.

Give him 1/2 teaspoon of gasex syru BD after breakfast and dinner.

Consult me for proper guidance

Start a probiotic and b-complex for a week. Or other option is a mixture of ginger lemon and black salt but the child may not make it easy for you to have it  so mix it with honey.

Consult ayurveda physician for proper diagnosis and root cause of ailment before consuming any medicine

Consult for prescription and guidance

"Loss of appetite and vomiting after viral recovery indicate weak digestion (ajirna) and gas formation. Ayurveda helps restore appetite and digestion safely in kids with mild herbs, diet correction, and digestive tonics. Avoid heavy, fried foods; give light, warm, homemade meals. I suggest you consult me for a personalized plan for your child.

Soak jeera in the water. In night. And morning boil the same water and. Give him to sip. Slowly. Add little rock salt in it and tulsi leaves.