Can God Use You if You’re in a Bad Mood?

Yes.

Paul was “grieved” by the actions of an evil spirit in Acts 16:16-18.  This is the same Greek word translated grieved in Acts 4:2, where the priests, the captain of the temple and the Sadducees were grieved that the apostles were preaching the resurrection of the dead through Jesus.  Other translations render that word in Acts 16:18 as annoyed, greatly annoyed, exasperated, and sore troubled.  However you want to express it, Paul was in a bad mood, but he commanded the spirit to come out in the name of Jesus Christ and it left.

Elijah was “subject to like passions as we are” (James 5:17-18), but that didn’t stop him from performing miracles.

In Mark 3:1-5, Jesus was grieved because of the hardness of the hearts of the people in the synagogue, but he told the man with the withered hand to stretch forth his hand, and the man was healed.

I don’t think anyone could think Jesus wasn’t in a bad mood in the account below, but He healed blind and lame people anyway!

Matthew 21:12-14:
And Jesus went into the temple of God, and cast out all them that sold and bought in the temple, and overthrew the tables of the moneychangers, and the seats of them that sold doves,
And said unto them, It is written, My house shall be called the house of prayer; but ye have made it a den of thieves.
And the blind and the lame came to him in the temple; and he healed them.

We are to do the works Jesus did (John 14:12).  If He could minister healing when He was upset, so can we!  Your authority is based on the Word, not on your emotions.

When it comes to spiritual gifts, God uses you in them completely by grace.  That means that your performance, your conduct and your track record with God so far has nothing to do with them.  Nothing in Scripture hints that you can’t be used in spiritual gifts if you got into a spat with someone before the service.  In fact, I’ve heard a couple preachers testify that they got into a fight with their wives before the service and yet there was a wonderful move of the Spirit through them.  One asked God how he could have done that and he said that God told him it was just a reminder that it wasn’t “him” doing what the Spirit did.