Nonnie, There is a big gap between serious depression and being a 'little upset'.
I can see that in the early stages of depression or where someone has episodes that this could help.
A member of my family suffered from depression all his life and I often thought that CBT that could help him to at least address some of his self-defeating behaviours, that fed into the depression. He used to do jobs around the house, but never did them properly because, he knew before he started that they would be a disaster - and of course they always were, which fed into his sense of hopelessness and helplessness. On those rare occasions, when, more by accident than design, things went well you could see a change in mood.