Separation from wife

Dear Lawyers, Iam looking forward for separation from my wife.We were married for 12 years and have a 11 years old boy.My wife has started tantrums after going back to her place demanding separation from my parents.She stayed with her parents for 8 months.And after coming back she is not contributing for any expenditure.All bills etc including my son's tuition fees are handled by me.She is a Dentist and takes care of her personal expenditure with her income.With my limited salary iam unable to coup with my old parents medical bills and the household expenses by myself. Iam not currently staying with my wife.I live in a different city in India. Iam looking forward for some legal advice to make her understand things at first else i need to move forward for Divorce.She already has declined my request for mutual divorce. Is there a law which can help Husband stay away and do not bear any expenses of household. Iam unable to perform at my work and feel mentally disturbed most of the time. Please guide.