Nightmares again.

I keep having nightmares about things that happened to me a long time ago. For the last week I've been having these nightmares again. I wish I wasn't. I'm not doing anything differently than I would usually do.
They just keep coming back and I've been trying to do alot of different things. I've tried listening to soothing music when I go to bed, I've been trying to eat different foods before I go to bed, I try to exercise throughout the day. I've tried alot more things than that and nothing seems to work. 
When I have these nightmares it leaves me feeling so tired and exhausted. I've just been tired and exhausted all week. I can't get much sleep because when I do sleep I have a nightmare again.
I'd rather be dead than have these nightmares again. That's how bad they are. I don't want to relive these things that happened to me. I've been waking up every morning exhausted and crying and it's just frustrating to have no control over that.
I really don't know what to do. I'm really on the verge of just killing my own self any day now. I'm tired of being depressed and exhausted and my life isn't going anywhere anyway. My body feels like it's just getting worse everyday. I'm just stressed all the time and can't get any relief even when I'm sleep.