Feel different and bad about the past !!

i am kinda feeling low today. Did something in past few months coz of which it is just eating me away from within. Cant tell it here, though blogs are supposed to be having all what u actually want to say. but then......I dont know yaar.. i just feel different..
in the past few months i have done something which i feel was not right.. i shouldnt have done it probably.. but then ...... aaa i dont know kinda confused.. miserable... dejected.. scared.. sick...happy.. lonely.. dont know ... feel something something