Positive Mitzvah 95: The Nullification of Vows
(The exact source for this commandment is considered a matter of question by our Rabbinic Sages.)

Sometimes, a person just cannot keep his promise or finds himself unable to fulfill his obligation. The Torah commands us to examine the situation. By dealing properly with the incident and judging the circumstances, it may be possible to absolve the vow.

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If you are confident that G-d will help you, then why is misery and anxiety written all across your face? If you are really confident, celebrate!

From: Bringing Heaven Down to Earth by Tzvi Freeman - tzvif@aol.com