Troubled dreams - how to stop them?

my girlfriend left me half a year ago. since then i have had constant dreams about life as if we had never split up. they are very realistic and so real that i struggle to distinguish some of them from real life. all of them are "good" dreams, but they are stopping me from ever moving on. Is there a way to control them, get rid of them, or any pill to stop me dreaming at all? Thing is taht when i dont dream of her, its usually something far worse. Ive died in my other dreams many times, and when i have the bad dreams they arent nightmares as you would think, but graphic and disturbing deaths - for example if you have ever watched final destination you will get what i mean. Those have made me to scared to travel on highways because a few involve our car skidding and then me being very graphically killed. I dont know what to do :S