"假期后的忧郁"用英语怎么说？

melancholy coming with the completion of holiday.

melancholy resulting from the completion of holiday.

melancholy arising from the end of the holiday

melancholy accompanied by the completion of holiday.

The occurrence to meancholy comes after the holiday comes to and end.

Being melancholy came as as result of the completion of holiday 

The melancholy after the holiday.

After-holiday melancholy

Post-holiday melancholy/depression

首先，赞同王老师简洁，地道回答，下面我还补充一点内容如下：

关于post-vacation blues补充内容如下:

Post-vacation blues (Canada and US), Post-holiday blues (Ireland and some Commonwealth countries) or justvacation/holiday blues or less commonly, post-travel depression (PTD) is a type of mood that persons returning home from a long trip (usually a vacation) may experience.

Background:

A person may suffer from post vacation blues after returning home or to a normal routine from a long vacation, especially if it was a pleasurable one.The longer a trip lasts, the more intense the post vacation blues may be. This is because after the person returns home, they realize how boring and unsatisfactory their normal lifestyle routine is when compared to the activities he or she did while on their holiday/vacation. It is easier to overcome/adjust to a normal routine the shorter the trip was. Post vacation blues may result in tiredness, loss of appetite, strong feelings of nostalgia, and in some cases, depression. Jet lag may intensify the post vacation blues.

Treatment :

In general, post vacation blues will wear off over time. It usually takes a few days, but in extreme cases it can last for several weeks for the mood to fully wear off. Faster ways of treating post vacation blues is for the person to share their experiences with family and friends, or to look at photos and souvenirs. Some may find comfort in re-living their holiday/vacation experiences, for example, if one really enjoyed jet-skiingduring their holiday, they may purchase their very own jet-ski for personal use. Another well known method of curing post vacation blues is to plan or book the next vacation, this offers a distraction and also provides the person something to look forward to. To beat the Post Holiday Blues remind self. (balance/features/blow-off-post-holiday-blues))=Blow off Post Holidays Blues/ author= Star Lawrence/reviewed by"A blank calendar means, literally, a clean slate," says Andrew J. DuBrin, PhD, professor of management at the Rochester Institute of Technology in Rochester, New York. "Think of something positive as of this very minute," he advises" webmd.com Stress and disappointment can get you down do not dwelling on the past stay positive.