Dear Nurhos,
Thank you for sharing this with us. I'm sorry to hear that you are going through this tough time, and that you are facing problems in your relationship. Sometimes couples who face issues in a relationship may find relationship counselling helpful, where you and your wife can discuss the problems with a trained professional. However this would require your wife to agree, and I'd advise you to speak with her not when she is angry, but when she feels calm. Perhaps then you can address the avenue you want to take to solve the problems in your relationship.
In my opinion, I think the first step to solving a problem is acknowledging there is one in the first place. It seems that you have done this already by posting here, so well done. Now it is up to your wife to also acknowledge there is an issue. Again, open and honest communication is a good way to do this, especially when she is calm.
You mentioned you were concerned if your wife's violent behaviour is a symptom of mental illness. Sometimes mental illnesses can cause violent behaviour. However violent behaviour alone when angry may not indicate an illness and she could just be very angry and not know how to express it. If you are concerned she has a mental illness, it would be a good idea to talk to your GP, if possible, with your wife. This is easier said than done, I know, because there is a lot of stigma surrounding mental illness, but if you do suspect she is ill then like a physical illness it should be treated. However the best person to make that judgement is a medical professional.
Even if she is not diagnosed with a mental illness however, it may still be a good idea to see a psychologist or counsellor to help her with how she can express her concerns. As Hayfa said, she may be insecure about your relationship and unsure whether your ex-wife is still in the picture. She may also still feel hurt that you didn't tell her all the details of your previous relationships. This are all valid feelings, and it is important that you show her that what she feels is real and valid. But the way to express this should not be through hurting you or abuse, and so it is really about learning the best way you two communicate. Again, mental health professionals and other relationship counsellors may be of help with that.
Finally, regarding your mental health, it sounds like you are worried and tired of dealing with the abuse. It is crucial you stay mentally well and take care of yourself.
Josette