My dad is psychotic and abusive and has been estranged for the last 4 years, but recently it's come to my attention that he is looking for me and has found where I worked due to one of his friends seeing me there. If or when he comes into my work place, how do I deal with that? Do I have to treat him like any other customer or can I get somebody else to deal with him? Years of emotional and physical trauma have given me anxiety by just the thought if him. I don't think I can be in the same building or speak to or even look at him.