Extreme negativity and anxiety, anger.

I am going to get married after 2 months & my Phyoncee wants to break up coz he is not able to handle my anger anymore. I am basically a very hyper and anxios person & my childhood was traumatized because of my dad. I over react & a beocme extremely affected and sensitive with other behavior. When I become angry, I scream, I become physically and verbally abusive which is leading my relationship to a break up which I am really scared of. I make up mind not to fight and somehow I end up having ugly fight with him. After the fight also I become extremely anxious coz I think it's gonna distance my boyfriend. I am panicking all the time for fight as I am not able to belive myslef anymore. I am looking to end my life as I am feeling helpless thinking that I can never change myslef and always will be angry and my relationship will end. I want to be happy and want to make people around me happy. Finding solution to end my life. Please please help and let me know what exactly I should do.