Thank you for sharing your difficulties with us! Remember us thinking about you the next time you feel stressed, remember we are here to listen and see if we can maybe tell what we'd try in your situation.
The voice telling you to hit people; I'd maybe try to get around it by carrying a little Lego character around with me and gripping it tightly when you hear the voice; pretend it is the owner of the voice and "hit" it instead (just squeeze it in your pocket while imagining it is the owner of the mean voice, see if that helps).
I'd see if I could buy a sleep mask
http://www.dreamessentials.com/categ...-and-eye-masks and see if that might make you feel you had more protection from Blue?
Do you have a list of things that make you feel more comfortable or that comfort you? I'd think about it and make one, see if I couldn't get some ideas of things to distract or comfort me when I was feeling anxious. I carried around a tiny, stuffed, jointed bear with me for awhile, it was my "protector" (named Queen's Knight, I still have him) and having that comforting little secret with me helped me sometimes in stressful situations when I was away from my normal "place" I was familiar with.