I have been having an earache for about a week.

我朵已经痛了一个星期了。

With earache, toothache and stomachache and backache, it's optional.

对于痛，牙痛，胃痛和背痛，加不加冠词是可选择。

An earache is a sharp, dull or burning pain in the ear.

痛是部剧烈，迟灼热疼痛。

Finally the Marionette, in a voice sweet as honey and soft as a flute, said to his companion: " Tell me, Lamp-Wick, dear friend, have you ever suffered from an earache? " " Never! And you? "

“告诉我，我亲爱朋友，你从来没害过痛吗？”“没有！你呢？”