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To fight negative emotions we have to stop thinking over and over again about the problem. Instead, do a Google search on the best Scriptures to memorize. Find a few that speak to you and get started. God is way bigger than the problem that triggered your emotion. Let Him speak to you through scripture.
Secondly, depression is not a Godly trait. To fight depression pray: “Father, what do You want me to do.” Of course, you can do a bunch of the ideas listed on this site, and they will help. But… give God a chance to show you something.
Jeremiah 29:11 ESV
For I know the plans I have for you, declares the Lord, plans for welfare and not for evil, to give you a future and a hope.
Pray one million times: “Father, show me the plans You have for me.”
If you are obsessed with what God wants… you will be well on your way to defeating negative emotions.