since my friend passed away about a year ago, i am always thinking about death.
mainly at night when i go to bed, i'll start to think about where ill go and if i really believe in god or not. Sometimes i cry myself to sleep because i cant bear the thought of dying suddenly and not being able to tell everyone i love them ahead of time.
Lately i freak out if my mom is not home 20 minutes after work- afraid she's been in a crash. I also call my little brother right after he gets out of school to make sure he's gotten home safely.I assumed things like that were normal, But one night i actually brought on a panic attack from crying so much about it.

This "problem" has actually begun to get so bad that my doctor is considering diagnosing me with OCD.

Karmic

Just relax. Everytime you freak out or feel uncomfortable, think of your mom or any one who loves you dearly.
Talking about death, we all are walking corpses. Moment of death is uknown to us. Millions of fetuses do not make it. Worrying about death is completely okay.
When you are relaxed, try to think of millions of other human beings who die for many reasons-tsunami, war, diseases, etc. and try to take in their pain-breathe in their pains and breathe out your compassion to them.

smearcase

Christy had all the words I was searching for.
I think a big part of your concern may be caused by your indecision about God.
While you are trying to decide, consider adopting the last sentence of Christy's post.
Try prayer in place of the worry for a while.