Divorce

I m a woman aged 31 years. I have a son who is 1 year old. It's been 6 years since my marriage. SInce past 6 years my in laws and my husband have been verbally abusing me and when I counter back they say I m not a good "bahu". We live in USA and my in laws in odisha but still if my husband and I have any quarrel, my in laws immediately call and shout at me . It's been 6 years I can't take it anymore , with those bad slang words and insulting my parents all the time. In my marriage I got gold jewelry worth 6. 75 lacs and half of it my mother in law has kept and she won't give it.My husband stopped sleeping with me in September 2013. For the baby we had to be in conjugal relationship for 3-4 months but after that we haven't had any relationship. I have asked him many times, but no answer I think either he hates me, or he has some other woman or his parents have asked him not to I don't know, we don't even talk at home, i m a stay at home mother. Is there still any hope I can ever have a happy life, if I divorce him will he take my son. My son is my life, if there is any way I can get out of this marriage with my son, I ll definitely do it . Is there? How costly is a divorce.i m a computer science engineer hopefully will find a job to meet my sons needs. Please help me.