lovesickness
/ˈlʌvˌsɪknəs/
noun
- The feeling of being very sad, anxious, or physically unwell because you are in love or because the person you love is not with you.
- She couldn't eat or sleep, and her friends said it was just lovesickness.
- He suffered from lovesickness after his girlfriend moved to another city.
- The poem describes the pain of lovesickness when separated from one's beloved.