Then I decided to do some research.
Retail therapy is shopping with the primary purpose of improving the buyer's mood or disposition. Often seen in people during periods of depression or transition, it is normally a short-lived habit. Items purchased during periods of retail therapy are sometimes referred to as "comfort buys".
According to one study falling into self-centered thinking is one result that comes from sadness. (Let's call it the "Poor Me" mentality.) When someone feels sad they're often looking for a distraction or something to make them feel better.
Often times, we'll allow ourself something that we otherwise shouldn't have. (i.e. do you need another pair of shoes? do you really want to eat a 500 calorie dessert?) Maybe not, but Poor Me, will probably talk you into it for a mood lifter.
That being said, the effects of this are temporary, and if prolonged may lead to further stress and depression as a result of either debt or in the case of the 500 calorie dessert, unwanted weight gain.
Retail Therapy is real, but it's not much of a solution as it is a diversion.
So, maybe in the future use the golden rule of waiting 24 hours before you make a big purchase, especially if you make it when you're down in the dumps.