I have a phobia about having people, especially men, I don't know in my house or even on my property. This causes problems when I need to call an electrician, plumber etc. I usually have to get one of my sons to deal with it.
I know exactly why the phobia developed. My ex-husband was a violent man. One day we had a blocked drain and we had to call the plumber. My husband phoned them and after he did he left the house for about 3 hours. The plumbers came they quickly fixed it and I had no problems with them being in the house. When my husband came back he asked me if the drain was unblocked. I said yes. He asked me to run him a bath which I did. After I told him the bath was ready, he accused me of "having it off" with the plumbers when he was out. When I denied this he dragged me into the bathroom and held my head under the bath water. When I had struggled a bit he pulled me out and told me I had to admit the truth. Once again I denied it, so he pushed me under again and kept me under a bit longer this time. He kept doing this until I 'admitted the truth' and when I 'admitted the truth' he bashed me.
As a result I became very scared to let any man in the house and, though my ex-husband left a few months after this incident I have never overcome the anxiety despite the fact that I haven't seen my ex-husband for more than 25 years.