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The antibiotic that your son is taking should be sufficient to clear the infection he has had in his ear. One major cause of the relief he is feeling is the tear in the eardrum
. Don't worry, this will repair itself. The burst eardrum is like having a natural eartube in place. The yellowish liquid is the infection draining from behind the eardrum. This may continue for a few days. He may also have decreased hearing on that side, but this will also return as the eardrum heals.
Ear infections are made worse by parents who smoke around their children. If anyone in the household smokes, it would be best if they were to smoke outside.
Just mention the burst eardrum to your son's pediatrician
at the next visit so they can monitor the healing process.