Question about taking xanax?

I started taking it after a friend of mine died and I started having issues. I also take welbutrin twice a day and ratinadine 300 mg once a day. The problem is when IO take the xanax, it removes completely, my normal fear response. I almost got into an accident in my truck, and throughout the whole thing, I was completely calm. No fear. Where I SHOULD have been scared out of my mind, as I slid into oncoming traffic and almost became a semi's hood ornament, I wasnt scared at all. Is this normal? Or should I talk tyo my doctor about this?