Your last sentence is the answer to your question. You said, "I am really worried that something bad could happen in real Life." it is actually a self-fulfilling prophesy. Fear brings on dreams of fears. You know your mother has no special target on her back that says, "Run me down," or "Hurt me," or "Kill me." Dreams are made of fears and emotions, so how about thinking of some happy emotions including memories of your mother? Soon your dreams will include the true feelings you wish to express to your mother. Do new things with her, and create new memories, and new dreams.