If you want to be liberated from the demonic spirit of heaviness, one of the best ways is to worship and praise God.

To console those who mourn in Zion, To give them beauty for ashes, The oil of joy for mourning, The garment of praise for the spirit of heaviness; That they may be called trees of righteousness, The planting of the LORD, that He may be glorified (Isaiah 61:3 NKJV)

If somebody has wronged you, forgive the person for your own good. You were designed to operate by love, not by hatred or bitterness.

Ephesians 6:11-18 – Demons can manifest as spirits of infirmity and cause sickness.
The woman who was bent over for 18 years had a spirit of infirmity and she was healed by Jesus.
It’s not always necessary to call out the demon by name in order to cast it out. 
We stand because we are on victory ground. We pray from victory, not for victory.
A prayer made from desperation will not work. Pray knowing that God loves you.
The epistle to the Ephesians is divided into three parts: Wealth (rest, sit), Walk, Warfare (stand).
The devil wants to move you from the victory ground, but you must continue to stand on it.
All the part of the Armor of God represent doctrinal truths in the Gospel, not of the Old Covenant.
These are objective truths, not subjective truths.
If you have wrong believing in any area of these, that’s where the devil will attack you.
Truth (as a belt): To hold your outfit together and to keep your weapons in.
Breastplate of Righteousness: Your inward man must be protected by knowing that you are the righteousness of God in Christ.
Gospel of Peace (as shoes): You will stand on firm footing when you have the gospel of peace.
Shield of Faith: Rely on believing in God for your justification rather than on your own obedience.
Helmet of Salvation: This helmet must be received.
Verse 18 if translated correctly like in Young’s Living Translation should begin with the word through (in Greek: dia).
We receive the helmet of salvation and sword of the spirit by the means of praying in tongues.

Put on the whole armor of God, that you may be able to stand against the wiles of the devil. For we do not wrestle against flesh and blood, but against principalities, against powers, against the rulers of the darkness of this age, against spiritual hosts of wickedness in the heavenly places. Therefore take up the whole armor of God, that you may be able to withstand in the evil day, and having done all, to stand. Stand therefore, having girded your waist with truth, having put on the breastplate of righteousness, and having shod your feet with the preparation of the gospel of peace; above all, taking the shield of faith with which you will be able to quench all the fiery darts of the wicked one. And take the helmet of salvation, and the sword of the Spirit, which is the word of God; praying always with all prayer and supplication in the Spirit, being watchful to this end with all perseverance and supplication for all the saints
(Ephesians 6:11-18 NKJV)

The epistle to the Ephesians is divided into three parts: Wealth (rest, sit), Walk, Warfare (stand). The devil wants to move you from the victory ground, but you must continue to stand on it. All the part of the Armor of God represent doctrinal truths in the Gospel, not of the Old Covenant.

Keep the Whole Armor of God on you by Believing Right  

Hebrews 12:20 – Mount Sinai is where the Law (Ten Commandments) was given.
The moment you take the place of depending on your obedience, the devil will fire his fiery darts at you. 
The fiery darts are his accusations against you, trying to make you feel condemned. 
When you pray in tongues, you can quench the fiery darts of the devil. It will combat against the anxieties and worries you have.

(For they could not endure what was commanded: And if so much as a beast touches the mountain, it shall be stoned or shot with an arrow. (Hebrews 12:20 NKJV)

I Thessalonians 5:8 – You must know that you cannot lose your salvation. 
If not, without the sure hope, there is a crack in your helmet of salvation. 

But let us who are of the day be sober, putting on the breastplate of faith and love, and as a helmet the hope of salvation. (I Thessalonians 5:8 NKJV)

The devil can quote from the Bible but it’s never accurate. It’s always for the purpose of deception. 

A believer can never commit the unpardonable sin of blasphemy against the Holy Spirit. 

The moment you are saved, it is for eternity. We are held in Jesus’ hand and also held in the Father’s hand, totally enclosed and protected. 

Our free choice is not so powerful – It is not possible for a believer to renounce Jesus and his/her salvation. 
A sinner also cannot renounce the devil or his/her sinner-ship.
Sinners sin because they are sinners. 
We are sinners because of Adam’s sin. But by one Man’s obedience (Jesus), we are made righteous. 
What the Last Adam (Jesus) did is more powerful than what the First Adam did. 

We are protected today because we are in Christ risen.