Husband blackmailing that he will take divorce from me

Hello sir,I am roja from Andhra Pradesh,age 28.m hindu but we go to church from chaoldhood.myusband name is vrajesh Gujarati,he is 45,he is also a hindu.we had love marriage in 2014,in church,one girl in 2015 and one may in 2018 January, I am physically handicapped and my husband know very well about it before marriage,my husband's family didn't attend to our marriage and don't like me because of my disability,and now my husband also blackmailing that he will give me divorce and he will leave bealcause of my disability,and he is threatening me that he will take my kids far from me,and abusing me a lot because of disability,now he hates me a lot,ias I said he is45,he is behaving strange behaviour like a aged person,aide hi ki sah usiko malim h mereko much BHI nai malum.always he is abusing that tereko kich nai aata kuch l nai karpayegi.bachho Ka Khayal rakhna nai aata and abusing me by unparliamentary language,from 2015 ,but I am tolarateting his torture just fbecause of my kids sake,but now his blackmailing bahutj juada hogaya h Mai kya Karu sir, I am b.com completed,Nd now studying MCA,how can I protect my children ??possible suggestions sir