Lovesickness

Lovesickness is a condition that you are either in love or you missed someone you were once in love with.

Wizarding Terminology
Lovesickness is a rare disease that can inflict chronic depression, and other mental health-related issues. This is often inflicted easily by the Breakup Curse. Other causes can be not being accepted (as partner) numerous times in the past. Unlike Clinical Depression, one is still able to do basic tasks, but may or may not be able to do well in academic performance, depending on the situation.

Known Symptoms
Symptoms include but not limited to the chart below. Similar to the Breakup Curse, the symptoms are similar, but do not inflict nausea. Simplexes can increase depending on the severity and the tragedy.

Christopher Lewis
On October 18, 2015, he was cursed by Lord Voldemort in the cave whilst trying to hunt down a horcrux. This gave him a Simplex III at first, then increased to a IV as the symptoms worsen. Since then, he lost his girlfriend. Alongside, his ability to search for another girlfriend has been significantly reduced. And for three years and so on, he has been slowly suffering this disease, and it is slowly taking over his life, and destroying him completely. However, on the Week of December 16, 2018, he is found to be rejected by either observation or through conversations five times within a week, and was nearly killed that Friday night after that, and the National Suicide Prevention Hotline District 23 was notified.

Trivia

 * Lovesickness does not exist as a serious medical condition in the Muggle World
 * However, it is very rare that it is diagnosed to a Muggle. Therefore, treatment services are scarce.