It could be an OCD, but it would take a qualified professional to say for sure, but definitely it COULD be. I have an OCD dealing with death as well.

It could also be a very real problem called hypochondria, which also stems from panic and anxiety disorders.

Perhaps you should ask your doctor to be sure what it is. Just be frank and talk about it openly, if you trust your doc enough to do that.

Take care and best of luck!
Kimberly.