Is it normal?

Is it normal to be so repulsed by someone? Every little thing they do angers me beyond belief! From over filling the kettle to opening MY crumpets ... Resulting in me throwing them out of the window... I can't even sit in my own living room because I don' t want to be near them. I feel horrible for feeling like this I don't even know why he angers me so much. I am left feeling guilty all the time. I suppose the nightmare I had didnt help because it disrupted my sleep and I woke up in tears. You see in the nightmare my little brother died it was awfull i awoke with such a sense of grief and dispair I imagine that can't have helped the mood i woke up in. I know my hormones are all over the place but is it normal to feel such contempt for someone when in reality they have done nothing to explain these feelings???