Thanks for your query.
By your description your son is suffering from Upper Respiratory Tract
Infection which probably has involved his ears. Infection of the middle ear/s is very painful. I hope the doctor in the hospital examined his ears by an otoscope
to look at the ear drum which alone can provide information of middle ear infection
. Sedative would certainly make him sleepy for a while.
Conitnue giving T-minic and steam inhalation for some relief and get the ears examined to rule out middle ear infection.
I hope I have responded to your query to your satisfaction. Please revert back if any clarification is required.
Wishing your son an early recovery.