I do not love my husband anymore, and I want to leave but do not know how?

I am married and have a son from my previous marriage, the same age as my husband son from his previous marriage. The mother of his children ped away and I helped raised his son and his daughter. My husband, my son, my stepson and my step daughter were involved in a car accident and she ped away at the age of 6. I supported him and we made it through that horrible time. but now our sons are both 8, things are just falling apart. my husband is verbally and emotionally abusive about little things like how i would pack the dishwasher or the freezer. If i do not do things his way, he would verbally insult me in front of our children. if I dare to speak back he would hit me and tell me to pack my and my sons bags and Fu.. Off. The next morning he would be very sorry and beg me to stay. He is emotionally and verbally abusive almost every day but the physical abuse only happens once or twice a month. I want to leave him but I can not afford to do so, I am working but my salary is too small to support me and my son and pay for my part time studies. His attitude of his son is the best and mine are just there, causes big problems and it has come to the place where i feel that I do not like my stepson and that I am tired of his son being favoured. It would still take me two years to finish my degree and I thought about immigration as I do not realy have anything (family or friends) that would keep me and my son here. I am at my end and is tired of walking on eggshells and pretending to be okay, while in my heart I would do anything to get me and my son out of his house. Please I need help