Bad moods are a drag. Every human being has feelings and we are impacted by negative circumstances and situations that occur, many times by what people say and do to hurt us. However, moodiness, sadness, frustration, depression, broken-heartedness, and other negative emotions are a result of our fallen nature brought on by Adam and Eve (Genesis 2:15-17; 3:1-7; Romans 5:12; 3:23).
Now that doesn't mean that having such bad feelings are sin in itself. Negative emotions and feelings are the natural effects of our being separated from perfect unity with God.
When a person recognizes their need to repent and believe in Jesus Christ, they are restored in a relationship with God through forgiveness, and then the Holy Spirit comes inside of us and stays throughout the rest of our lives (Acts 2:38; Eph. 1:12-14).
The Bible teaches us that the Holy Spirit has the power to replace bad moods with joy and peace of mind.
But the fruit of the Spirit is love, joy, peace, longsuffering, kindness, goodness, faithfulness. – Galatians 5:22, NKJV
It is normal and human to experience emotions like moodiness, depression, fear, frustration, or anger, for example. However, as Christians we can pray that the Holy Spirit would feed us with the fruit of love, joy, and peace.
There are many verses in the Bible that teach us how God helps us to overcome the bad moods we experience.
Those who mourn are blessed, for they will be comforted. – Matthew 5:4, HCSB
Blessed be the God and Father of our Lord Jesus Christ, the Father of mercies and God of all comfort, who comforts us in all our tribulation. – II Corinthians 1:3,4a, NKJV
Turn all your anxiety over to God because he cares for you. – I Peter 5:7, GW
Come to me, all who are tired from carrying heavy loads, and I will give you rest. Place my yoke over your shoulders, and learn from me, because I am gentle and humble. Then you will find rest for yourselves because my yoke is easy and my burden is light. – Matthew 11:28-30, GW
Granted, we can be stubborn. We many times want to "keep" our moodiness until it runs its course. And sometimes it is important to give ourselves time. Anybody can get in a bad mood for a variety of reasons, but no matter what, Christians can trust God for His love, joy, peace, comfort, care, and rest. It is ours for the asking.
Ask, and it will be given to you; seek, and you will find; knock, and it will be opened to you. For everyone who asks receives, and he who seeks finds, and to him who knocks it will be opened. …If you then, being evil, know how to give good gifts to your children, how much more will your Father who is in heaven give good things to those who ask Him. – Matthew 7:7-11, NKJV
For the eyes of the LORD are on the righteous, and His ears are open to their prayers. – I Peter 3:12a, NKJV