HI!
I wanna tell you that, a year ago, I was in your position. I was absolutely sure I lost my salvation. I was desperate, I couldn't sleep well, I was under great fear and anxiety and there were moments in which the pressure was so high that I was felling how arrows were entering in my mind and it was terrible (Ephesians 6.16). I was feeling that EVERY verse of the Bible was condemning me except Psalms. So I started to read loudly Psalms every day, even though I did not believe that they can still help me. After a time, against my will and emotions, I began to read and to memorize and quote whenever necessarily other verses from the NT. I was still feeling condemned, rejected by God, full of fears and worries, but I chose to stand on God's Word. Little by little, I started to feel lighter- I started to feel God's presence again, to feel better, to feel a little bit of peace or joy. It was a long process but now I can finally say that I believe that I am saved not because of me, but because of God's grace and love. Yes, I still stumble and sin, but I repent, I call sin sin and I hate it, but I apologize, confess and then believe that God will help me overcome it.
I am telling you, once you pass over this, with God's help, you will see that you will have a different approach towards salvation. I've seen in my life and in others life that we often take salvation as granted and we aren't that grateful and excited and moved by it. But now, when I've passed through that dark period, I am so excited and grateful and overwhelmed by the fact that God really chose me and saved me!
Be encouraged and start to believe and quote the Bible which is the truth! He will set you free!