Can there be any way to treat a double ear infection without having to see a doctor?

See a doctor: Don't wait on this and run the chance that it turns to something worse.

Comfort measures: Some viral ear infections self heal in 2-4 day. Bacterial infections tend to persist and may lead to real complications. If not better after 3-4 days of comfort care, an evaluation and treatment is advised.Prior to antibiotics, hearing loss due to chronic middle ear disease was not uncommon and a significant complication called mastoiditis requires surgical drainage.Infants should see the doc.