I sounds like you are just stressing out, and that the negative moods are having a negative impact on your dreams. Remember, what you worry about in a lucid (or regular dream for that matter) is what is most likely going to happen, since you are thinking about it. The best way to get rid of something in a dream is to just distract yourself, find something else to think about, and forget about it.
If you work on your confidence and dream control, you should be able to learn to remain rational even in these nightmares by reminding yourself it is a dream, and to banish or beat the crap out of, or my personal favorite, befriend, whatever is bothering you If it was me I'd say something crazy like, "HEY! It sounds like you're almost out of ammo, do you want this clip? And do you wanna grab lunch?" Just completely turn it around and see how friendly an aggressive DC can be 
Try these links 
http://www.dreamviews.com/community/...ad.php?t=63603
http://www.dreamviews.com/community/...ad.php?t=57283
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