Divorce

I am 28 yrs old ,mother of one yr old son , its been two and a half yrs to my marriage and life has always been hell ,my husbands mom has always been there to create trouble between us. She started her taunting on day one,when i entered her house ,since 3rd day my husband started beating me and since then nothing has changed. We tried giving our relation a chance and we planned for baby but still ... things are still the same. That woman is a single parent , she thinks she is very brave and smart so she can dominate me. I agree my husband has got her responsibility as there was never a father in the picture but does that mean she will stay in the same house and kill our relationship with every passing day. She tries to be a sati savitri in front of her son and when with me she shows her true colors and only thing her son says when informed about her behaviour is that she doesnt know what to speak and where to speak...so ignore her. My problem is i cant ignore her words at all...it kills me deep down somewhere everyday... Its been 3 yrs..i havent been working so financially i am dependent on my husband...i used to work earlier . I just left it as i was working with an reputed firm and had flexible shifts which was something no body liked in my husbands family...as well as we have moved to a different state so not able to work anymore with a 1 yr old baby What should i do to make my life worth living , should i leave him and file for divorce as i have been thinking bcz things are just not getting better between us .. all thanx to that one woman . I dont even feel like saving this relationship now.kindly suggest