Many people feel like they are going to die soon. For some, the feelings linger and eat away at them. Others get over the feelings and live their life. I hope you can forget theses feelings because they cannot improve your life. They can only harm you.
Sometimes this reflects a fear of dying . Ditto to getting over it and getting on with your life. Remember to live in the present where fear cannot reside. Fear is about the past and the future. Right now in this moment you are alive :)!