Ear Infection HELP!

My LO had a fever Sunday night so we took her to dr Mon morning and was diagnosed with an ear infection. He gave her amoxicillian. Here we are Thursday and she seems just as miserable. How long should her discomfort last? I just feel so bad for her I don't know how to help or if there is an end in sight. I'm a FTM so I have nothing to compare to. Any insight is appreciated.