Is using God's name in vain a mortal sin?

Today, I was frustrated over something, and I inadvertently blurted out God d*mn it. I was immediately upset and sorry. It was quick and unintended and it was in no way meant as a blasphemy toward the Lord. I still fear however this is taking the Lord’s name in vain. Is this a mortal sin or a venial sin?

[FONT=Arial]The following links should assist you in better understanding the Catholic Church’s teaching on using the Lord’s name in vain. If you have any further questions or concerns that are not answered by these links, please contact Catholic Answers directly.[/FONT]
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]“Oh, my God!”?
][The Third Commandment](“http://forums.catholic.com/showthread.php?t=49607”)
]Is profanity a mortal sin?
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Using the Lord’s name as a four letter word

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