Thank you for your query and excuse me for the delayed response to it.
Your son should be shown to a doctor and got checked up. Fever
, lethargic, vomitings, pain in right shoulder and laboured breathing can be suggestive of sub-diaphragmatic abscess
which can be picked up only on an ultrasound
examination. As your son is getting thirsty he is getting dehydrated and needs immediate attention.
I hope I have responded to your query to your satisfaction.
Wishing your son an early recovery.