buyer's regret

An acute sense of regret following a purchase, especially an expensive or extravagant one, due to conflicting feelings of guilt or uncertainty about the decision. I was so dazzled by the new car that I signed the contract right then and there, but I started having terrible buyer's regret the next day after I thought about how much money I'd spent and whether I could have gotten a much better deal for something more practical. She tried to convince herself that the new computer was as impressive as it looked in the store, but she couldn't shake that terrible feeling of buyer's regret. I always think shopping will make me feel better, but I usually end up with buyer's regret, wondering why I bought all this stuff I don't need.