Separation maintanance

I am Pooja(51 year old).My marriage life is not good from the beginning .We we’re living together for 12 years but they force me to leave the house.Then l lived in a separate house with my mother in the same city as my children (2 sons now 25 n 23 years old)could not leave their school in the middle of the session .My parents bear all our expenses and rent of that house as well .Then l moved to my parents home in Nagpur and stayed there for 5 years ,after 3and a half years l fielded for maintenance where judge told my husband to pay anterim Rs 25000 but he refused and filed a case against this in the high court.ln the mean time we decided to live together again for the sake of our children.So l came back but living in separate house with my children and my husband is living with his parents as well.My mother in law has full control on my husband whenever she is not happy with me ,she and my husband insulted me very badly and doesn’t give enough money for expenses.Now l am fed up with all this .l am doing some work (dance costumes making)with the help of my parents and siblings (living in US) for my and children (some)expenses and for the future but it’s very less.lf l file any case in future which can last for many years how can l manage all my expenses during that period of time