Hello Rajeev, welcome!
This is a very tricky issue and concerns me alot that your wife is threatening suicide. You said she harms herself and you have to use brut force to stop her. Has she ever hurt you? It seems she is using the fact that she is a physciatrist to her advantage to where you will never win the fight. This is only my opinion. I tend to agree with your friend that it's possible she does have a personality disorder. Unless you seek help for her, I see no way of resolving any of the issues. You will continue to be drained. Do you really want to live the rest of your life never to be happy again? This is a question you need to ask yourself and if the answer is no, then you need to find professional counseling for the both of you. I am not a doctor or anything close to it. These are only suggestions. I am just a simple person that feels compassion to your's and your wife's problems. I wish you the best and hopefully, someone that will have better answers for you will respond to your post.

Take Care,
Linda