hello and welcome to HCM,
I have understood your concern about the ear pain
and your shoulder pain
Since you have already started the antibiotic and since its only a day then you may wait for four to five days for the effect of the tablets to come through.
You may want to add tablet pantoprazole
40 mg twice daily before food for two weeks. Your doctor will know about this drug.
You can also try antibiotic injection like ceftriaxone
in dose of 1g if the pain does not get relieved.
Meanwhile do not strain or exert yourself too much and do not try to clean the ear
take care and get well soon
Dr Sriram Nathan