I would not put to much stock into the number 23, remember the numbering of the chapters and verses of the Bible was done by man, not God (I am not saying the Bible isn't inspired because it is, just that the numbering was added to assit in reading and studying). I too have a strong faith in Jesus and have had thoughts of death, but know it is just from my anxiety and depression.
I think it's great that you've discovered a spiritual element in your life. You may well have a higher conciousness that makes you feel extra perceptive about things. Even if you are having premonitions of death or being closer to God, that doesn't necessarily mean that it is definitely your time to die. I imagine that feeling of being with God is really overwhelming, in a happy, contented way. I am spritual too, in my own way, although I'm still on the long and winding road to finding my true awakening. But what I want to say to you is, assuming that you pray, maybe you could pray for God's will to be done in your life. You could pray that if it is your time to go, that God will take you to him, but if it is not your time yet, pray for God's protection and for his wisdom and guidance, and to take away any confusion or doubts you may have regarding your thoughts. Prayer can be powerful.
I am a christian too, I also thought I was dying a few months ago in the hospital during surgery. I think when I said to my daughter, "I think I'm gonna die", it was the wrong thing to say to your kid, ya know, but I was afraid, although I am a christian, fear of death and the unknown gripped at me for weeks. I think its spiritual forces of unseen nature tearing at our spirits. the time may be short till Christ returns to earth, or it could be the enemy trying to get to us through doubts and fears. to live is Christ, to die is gain, remember, that to everything there is a time, pray, read Gods word and remember that God does not give us the spirit of fear, but of love and peace.
I lost my son 3 weeks ago, but I am so sad and hurting because I had been getting premonitions for weeks before his death, my symtoms were all physical I went to my doctor for a checkup telling her that something was wrong with my body I had bad water retention, anxiety, sleepless nights, I thought I was going to die, now that my son has died in a tragic accident accident all the symtons are now gone. I feel so angry and upset with myself that I never took note of the signs my body was trying to warn me and I did not take heed. I got baptised 2 months previously to give my heart to Jesus and to ask for forgiveness for my sins I have been praying to God most days, and now it feels like my life is over I miss my son so much please help me here.