I wanted to know what Islam says about emotional, mental and verbal abuse in a marriage?

Emotionally, mentally and psychologically abusing one’s spouse is haram and forbidden in Islam. It is considered a major sin.

If a spouse is suffering from such abuse, they must address it with the abuser and let them know it’s not ok. Creative ways are effective sometimes. If that doesn’t work then they need to get someone involved for counseling. If nothing works and the wife cannot handle the abuse, she must see a scholar and see if he can help her can divorced from the abusive husband (assuming nothing else works).