The desperation and helplessness of the lover come through pretty clearly. The beloved is away in a distant place and here she is pining away day and night. Imagery is quite visual and it appeals to the romantic in the reader.
"My heart sings,
can you hear?"

Images of hearing sounds too is used well with words like whisper and sing.

The pleading in the voice is heard well.The first three stanzas illustrate the poet's longing, anxiety and concern for the lover who is beyond her vision, and touch. Separations seems to deepen her ardor and love for him which is akin to sweet ache in the heart.

Rhyming is used with discretion and control. Short lines deal well with expression of feelings.

It flows well.

Write on!