MelissaN, I am praying for you
Dear MelissaN, You're probably going through spiritual battles or warfare. Keep fighting back by rejecting the thoughts like a Christian soldier on the battlefield and replacing them with Scriptures that you can memorize about God's love, commandments, and expectations. You might want to read Ephesians 6:10-18, which is about the armor of God. Also, you can read a short article on gotquestions.org titled "How can I control my thoughts?" May all go well. In Jesus's name, I pray.
MelissaN, I am praying for you