1) your best option is to file for divorce by mutual consent . since your husband refuses to stay separate with you and your mother in law is making your life miserable better take divorce and move on in life
2) if you dont want divorce you can file complaint against your husband and in laws under DV act . you can seek right to stay in matrimonial home or laternative accommodation .
3) you can also seek maintenance from your husband and compensation for mental torture you have undergone .
4) you can also seek a protection order from court under Dv act .