How Can An Ear Infection Be Treated?

Hi, I am 67 years old woman and I have had a ear infection for 3weeks almost one month in a couple days .I have been to the walk in clinic , my doctor, and emergency room on New Years day all I have been given is an antibiotic ear drop called ciprodex otic 5 drops 2 times daily in each ear and amoxicillin for 7 days 2 . I went to my family physician he give me another ear drop that ER said don t start. I continued the ciprodex otic until New Years day I went to the E R they give me another ear drop called polymyxin b sulfate and trimethoprim and I ask for a culture of my ear my daughter said I had a greenish color pus like discharge. Culture will take up to 5 days ..What oral antibiotic will work for my ear infection? my husband and I are planning to go to Jamaica on Sunday for a weeks cruise and I am so flustrated that I can t get an answer. I m going back to the walk-in clinic my ear feels full and I have a throbbing pain just thought I might make a suggestion for an antibiotic when I go.