Temporary Custody Order

I have just recently left my husband. We have been together 6 years and have a son together who is 4 years old.  The greater part of our relationship my husband was unemployed as he some how always managed to get fired from the hand full of jobs he has had over the course of our relationship.  cost since he wasn't working, he was the  one that stayed home with our son because without his income we couldn't afford daycare.  Our son thinks the sun rises and falls with his dad.  Which is a good thing, except at the  cost of my relationship with our son.  My husband and  I had a lot of problems, not just that fact that he wouldn't hold down a job.  My husband would flip out about once a month over something that to always seemed ridiculous and he would call me names and hit and kick me.  And I would always try to comfort our son who would be cry8crying in fear and my husband would rip him out of my arms while calling me names and telling our son that its all Mommy's fault.  This has severally damaged my relationship with this Little boy.  Always, days after one of these episodes, my husband would admit the error of his ways and "say": he was sorry and it would never happen again.  But it always did.  
Two months before I moved a friend of mine came to stay with us.  I needed her there as I knew that the storm was coming because we were getting close to separating.  It worked as I only saw some thunder, never the storm.  Not until a week after I had moved  into my new apartment.  Jason was staying with my Friend as he didn't have a job or any where to go when moving day came.  Exactly 7 days after we separated, he comes to my apartment to drop our son off and he tells me that he is taking our son with him.  To make a long story short, I didn't want our son to go and as I tried to reason with him, he became irrational and grabbed my by my hair throwing me on the ground.  He broke my bedroom door and ripped my son who was crying away from my friend and got in his truck and left.  
The next day I went and filed a domestic violence restraining order and a temporary custody order.  The judge gave me both.  We have a hearing on March 7th. and I am terrified.  I don;t want to hurt my husband, and I would never try to destroy his relationship with our son.  But, I can't trust that he will never do this to me again.  I left him so that he wouldn't be able to treat me like that and so that our son wouldn't have to be around the fighting.  At 4 years old, my son thinks it's my fault that his daddy cant seem him.  He believes that I am the cause of the fight.  I have every reason to believe that my husband poisoned my son against me.  I am scared about this hearing.  I dint know how my husband is going to act in court or what the judge is going to do.  Wow, is this really my life?