Yes, all you have to do is just let go as early and fast as possible. Exercise or mini vacations is also the way to get your mind out of the depression state to a new state, it let your mind focus on new things instead of continue holding the depression.

The key is to act early and fast, because the longer you hold your depression, it will accumulate more and it becomes harder to revert to the positive state.

It is far more easier you quickly adjust yourself once you started to feel a bit stress, depression, worry. Refresh yourself immediately on the day itself, don't let it carry forward to the next day.