Maintenance and divorce

Sir, I have married In 1997 ,I have done B. E after marriage my start telling me to give divorce or else you face consequence, she frequently quarrels with me and mother and goes to her mother residence, after counselling she comes to my house and same process is repeated, We have three issues one daughter, and two sons .As I had a govt job as I was travelling daily to my office frequently my wife quarrel with me give and tell me to give divorce I will go for a job, as I am only son I can't leave my aged parents,after lot of meetings I provided a separate house even there also she quarrels with me and tells her brother to strangulate me if divorce not given, I have tolerated the torture for seven years, One fine day she left my house with all my house belongings without my notice,in the year 2003.i have waited for whether she returns to my house, I had filed a car in family for congitutional rights to join to my house she never returned immediately they lodged a 498a dowry case and taken my parents to police station my parents sent to custody and I was at police custody for two days they had taken undertaking to give the own house in her name as my house is in my mother's name again I was sent to J. C for one month again we came out and contested and the dowry case was acquitted after 12 Years, in mean while they put the cmc 125 and case was filed I had contested I had lost my govt job in the year 2003 Because of there harassment, I was doing daily wage job and was paying maintenance to her and children. In the meanwhile she had got a govt teacher job in 2006 and she doesn't disclose that she is working as she was getting the maintenance of her, again after 8 year's she asked for enchancemt for Rs1500 each the order was passed and at present she ask for further enhancement of Rs 5000 as of today my daughter age is 21 years, son 18 and 17 years respectively ,still I am paying the maintenance to all of them, now my wife asking for divorce as I have lost the job, I am jobless and my father expired and my mother is with me I have lost my status I am not willing to give divorce .Kindly suggest me what to do whether to claim maintenance from govt as I have lost my job and mentally disturbed now she is working as govt teacher, please any one can help me as I have faced the trouble for 22 years Thanks regard.