My hubby threars me about committing suicide,during our fights. Wot do i do?

We are married for three years and have a two years old baby. My hubby is absolutely authoritative,he takes me for granted. Abd if i ever try to protest he gets hyper,looses self control n threats me about committing suicide. Am not even allowed to show an off mood to sumthing i dont like becuz it triggers his anger. If i try to calm myself by sitting alone for sumwhile,it seems unnatural to him. If i react to sumthing,i am over reacting. But above all m so stressed about his threats,m on d verge of a nervous breakdown. He can vent out by shouting,accusing me or even crying but i CANT becuz he doesnt like it. It stresses him so i have to shut my feelings n emotions i cant vent out in anyway. Plz help me,how do i change this ill behaviour.

Updates
Thanx guys for sincere advises n your concern. He has already warned me that if i ever brought up this issue infront of anyone like my parents or his family,i'd be responsible for the results. If i suggest leaving the house he z even more wild n mad. I have studied medicine n i understand the need of counselling for both of us but he thinks its funny. I asked him i want to seek professional help as i just cant take it anymore n stess is showing physical symptoms,he said docs will only prescribe u tranquilizers,u better take them by urself. My dream of a happy marriage is shattered but i cant take a stand becuz of my child. We are totally dependant on him. My family is nor so supportive :/