Really struggling with mortality and the thought of life after death…

I am a Christian and since finding God, it has been a long time since I have really worried about mortality or feared what happens after death. I love and trust God, and I know that heaven will be free from any suffering or negativity, but for some reason, tonight I have really been struggling with the thought of experiencing anything eternally for the first time in a while. I used to get really anxious about this both before and at the beginning of my life in Christ, but for some reason, it came back tonight and I’m really looking for some philosophical words of comfort and reason, because I trust that God will make sure that I’m okay, but I want my limited mind to be able to logically reason with that.