Weird thoughts and Re-Occurring Dreams

I have been having these kind of day dreams / thoughts / dreams for a while now. I am not suicidal or depressed just want to say that first. Perfect example was today on the way to work I saw a truck in front of me with a ladder on the back, all of a sudden I thought of the ladder disconnecting and smashing through my windshield and killing me. Or if I am at the red light just think of the car behind me just smash into the back of the me. I will be in the mall and think of falling down the stairs and cracking my skull open etc. It's like my mind can't help but picture the worse case scenario in any situation. As far as the dreams go even though I have never been in a war or army of any sort I keep having dreams about war. The one that happens the most is being in a fox hole with my cousin (who did serve in Iraq but have been having this dream well before hand) and four other soldiers. Artillery is firing off in the background and bullets are going over our heads, explosions are going off next to us covering us in dirt and dust. Then it all gets quiet and we hear a low rumble that keeps growing louder the one guy stick his head out of the fox hole as a bright light glows and as it hits him he face melts off and his body and skull which is completely charred and void of flesh falls in front of us and then I wake up. The only other one that I can recall happening is falling from a high height looking at my body almost from third person then first person till I hit the ground see the blood forming around me and then just sorta start drifting away from my body seeing it laying there motionless. Any one have any clues into what these may mean or am I just really fucked up....

TL;DR : Keep having worse case scenarios ideas and thoughts about death, Not depressed or suicidal. Also dreams of war and dying in my dreams even though I never was in the military.