You're just intruded upon, which could be seen as a type of 'sickness', but intrusion (including "attachment" and "possession" ) is something that happens to everyone, at certain times. In addition, the rage you felt, could also be a rage from a past life in which you might have been involved in a similar situation or circumstance, in which you felt rage, perhaps in a war situation, perhaps involving communism or a similar energy, etc.
To understand more about Intrusion :
http://infinity.usanethosting.com/Heart.Of.God/main.htm#SRTTo do a Hilarion Reading to ask for specific advice or on past life info :
http://infinity.usanethosting.com/Heart.Of.God/main.htm#Hilarion