Thanatophobia
Thanatophobia, is a fear of death or dying.  This phobia is rarely talked about.  Most people think they are alone if they suffer from this problem.  In reality this phobia poses little or no actual threat or danger.  Most people realize that this fear is an irrational one, but the thought of doing something about their fear might bring on a panic attack or create a severe anxiety attack.   Symptoms of thanatophobia according to phobia-fear-release.com are:  "breathlessness, dizziness, excessive sweating, nausea, dry mouth, shaking, heart palpitations inability to speak or think clearly, getting mad or losing control."