What should I do when my wife is torturing me and my family mentally

Hi, I came from a very poor family in a village in andhra pradesh and I wanted to change my family status and worked hard to get a good job in IT and then went to US as well. during my college days I was attracted to a women and we both joined in the same company and both are in a love for 8 years. I requested her many times to tell in her family to get marry. but she didnt. after I went to US and earning some good amount she told in their family and their family asked me money in return to marry her. i was surprised and denied. later somehow we got married and from that day onwards my wife and their family are threatening me and asking me for money. whenever I say no to them they are going to police and my relatives and meanwhile we got a kid and then my father expired. she is keep on threatening me to come to india. now I came to india and staying with her along with my mother. but now daily she is talking to me like we are her slaves and even if we say no to any small thing also she is threatening me to go to police or my extending family and villagers. last few days she is talking very bad words on my mom and forcing me to not to give food to my mom. what should I do. for everything she and their family are thretening me that she will file a false dowry case if I didnt buy gold for her. what should I do. kindly help