Karla,
I experienced a fear of death to more of an abnormal extreme that you are experiencing early with my panic. Every one on this earth knows it will happen and does question how will it be? What comes after?, etc. Yes you are in a stage of it being in overdrive. Mine hit me once I had children, it gave me a sense of my own mortality which was frightening. I had two little ones who depended on me, what would they do without me. My treating psychiatrist at the time talked with me about it, I will admit, it pops up every now and again, especially if I'm feeling health anxieties greatly. My problem was I thought nobody could raise my children like me, be there for them like me, comfort them like me, but only ME, not even my husband. (And he was/is good as a father), I deep down just had this irrational fear that if I should die, my whole family would fall apart, and not be able function without me. I was putting this tremendous burden upon myself. Sure I would like to think oh please let me go when I'm old, quietly in my sleep, I want to see my children grow up, see them get married, see my grandchildren, maybe a few great grandchildren, etc but there are no guarantees.
My stage was so bad, I got obsessed reading obituaries of people around my age, it plagued me, my doctor ordered that to stop. I couldn't watch episodes of tv like Life in the ER, it kept me sensitized too much. Sure I think out loud to myself even in a spiritual way, wondering 'Did Lazarus say to Jesus when he rose him from the dead say, I have been suffering, was at peace, and you bring me back? And I have to die a second time-what gives?'-Hey I'm human, I'm going to think of these things. Sure if would be easier if Jesus appeared to me and just told me face to face, or even a relative. But that is where faith has to come into play.
I will say, I started reading more and more of the bible, some chapters over and over, and new things would be revealed to me, that I didn't see before, and I even felt divine presence at times, validating the Lord was there.