If it were me I would not wait to get a psychiatrist's diagnosis or reassurance, etc. What if the psychiatrist said he was fine? It sounds like that's important to you, but he sounds dangerous. I would just run in the other direction from this guy period. However, I think you may need to be careful, if you decide to leave. Could someone leaving him be a violent trigger? You may need to find a secure way to protect yourself if or when you decide to leave, and plan for a way to protect yourself beforehand. Can you get a restraining order where you are? Are there structures in place to protect you?