What is this feeling?

I've been feeling weird for the past few weeks (four weeks?) My mind feels so light, it feels like i'm floating but i'm aware on what i'm doing. I also easily feel disturbed more so than usual, I can handle reading "Killing Stalking" until chapter 15 or so but now, I can't even handle the first chapter anymore. Negative thoughts have been racing by quickly anytime and I can't handle those thoughts that I just want to sleep to stop them but can't because of those thoughts. I may not make any sense but I just want someone to tell me on what this feeling is. Thank you..