I'm no psychologist but I hope my opinion helps.
The guilt seems to be the effects of anxiety. Both are evident in you because of the wild dreams you've been having and for the personal text that you filled with "on edge".
Guilt is a defense mechanism to protect the human ego. The dreams serve as a way for your mind to vent out all these distressing feelings through a safe place. You're waking up the way you do because you were doing it in your sleep (whether you dreamed it or not), again as part a way to safely release all the stress.
But to try to get to the cause of this using what you've said, the dream interpretations I'm reading mention a general feeling of powerlessness. Like you can't do anything about it and you're having problems dealing with it (and connecting that with what I said earlier, you might be feeling anxious because of that and your ego's masking that through guilt). Putting the meanings of your dreams together, that's being caused by a falling out you had with someone important or close to you in your life (supported by the dream interpretation: "...some important and significant relationship has been severed"). The dream interpretation for the killer you mentioned mentions, "...essential aspect of your emotions have been cut off", which leads me to believe there may be issues with the family, a lover or very close friend.
I don't know what happened and frankly, that's none of my business. I will suggest, though, taking some time off to ease the pressures associated with the situation. Don't put so much on yourself because it's not actually your fault, even if they may tell you differently. To help you better deal with everything, I recommend a psychologist. Talking it out with somebody more able to break all of this down and to offer more helpful and insightful advice can only do good for you. Whichever decisions you decide, I wish you all the best. I really wish I could do more for you, man.