I just had my first big challenge to be able to help someone and I guess I failed.

Well after trying to help someone, this person basically threatened to kill me and it was after the person had taken a medication (I forget what it was since I am not that familiar with any medicines, I will find out later). I know the person didn't really mean it but it was just way above my tolerance level. This is someone I know fairly well. I guess I will have to break off communication with this person at least for a while and let time and things do their work. I was really quite angry because I considered the person a friend and I don't really know what to do.