First of all you need to know you have not committed the unpardonable sin. The only unpardonable sin is rejection of God’s plan of salvation through Jesus Chris which is calling the Holy Spirit, who draws people to God, a liar thus blaspheming Him. All sins are forgivable except the rejection of salvation. As you struggle to overcome your depression the Enemy will attack you in all your week spots and attempt to make you feel even more miserable. But one thing you don’t need to worry about, as long as you don’t reject your salvation, is committing the unpardonable sin. I have prayed for you dear Sister.