Last night I had a dream that I killed a lot of people in an amusement park for no reason, just because I was angry and wanted to, and no one was able to see me doing it. Then my dream cut to my dad's house and my brother was there watching TV in the living room. I killed another random stranger who was in the house, only I hit him probably 3 times harder than everyone else and his face was terribly bloody and mangled. Still, my brother was unable to see me doing this. Even though no one was aware of what I had done, I felt this extreme anxiety during the dream like I was running out off time before they all saw me. Every time I hurt someone I tried to "fix" it by cleaning off their wounds with this big white towel that I kept in a shoebox, which, at the end of the dream, was all red. I tried hiding the last person I killed in my dad's garage but when I opened the door there was this dusty old piano there and the person told me, "When pianos such as this are even slightly off tune, you should just throw them away because they'll never sound the same again."
When I woke up from the dream I had this big head ache. I had a headache when I went to sleep, and still do, but it was at its worst when I woke up from the dream. My first thought when I woke up was "OMG I was a serial killer" I don't know what to make of it

I've never had a murder dream before.