No worries OP, lots of us have been there, and without the internet, understanding abusive relationships would have been even harder! I wish I'd have had mumsnet back then 
Erm. Honestly? I'm not sure who the real me is. I think it's more how I am today than I ever was before. It took a lot longer in my situation as my family are mostly arseholes too aren't I lucky
But, lots of normal treatment from my DH, and we now have 3 children...I think I am 'me' or at least a new 'me'.
Not sure if any of that makes sense!
I left my relationship lots of times, but went back to family abuse, so I ended up back time and time again. Eventually I couldn't stand the thought of DS turning into him. So I drank a bottle of wine (not recommending, just being honest) after yet another argument and I grabbed my bag, and my son, and left. It didn't go that smoothly, and I had to call the police, because he wouldn't let me leave.
I got out of the frying pan and into the fire, but it was a different sort of abuse. More emotional with family. Silent treatment, critical, undermining my mothering skills...that sort of thing. I put up with it, because I had no where to go.
I worked my arse off and saved and saved to GET OUT.
With contact, I really really would fight this. Have you got any evidence of abuse? Did you make any notes, or can you make any now of all the things he has said/done?
You really shouldn't be in a battle over contact with a 6 week old. She needs you. And guaranteed he's doing it to have control over you.
With my situation, I made sure I was there with all contact visits. I noted his behaviour each time (sometimes he'd push me over, or tread on my foot in public) just to show he could still push me about as it were, even in public. He was always late, if he turned up at all. He never paid a penny. But I kept my son safe by being there. He threatened to take him away from me many times, telling me he would make up whatever he had to, to do that.
Eventually I got a letter from solicitor about my unreasonable behaviour, and how I was stopping contact! Anyway. I didn't have a lot of cash. But I went to a solicitor (who happened to be lovely) and listened to my whole story.
She unleashed the most fantastic letter about his past abuse. It was brilliant. He backed off. Got bored in the end. Set up shop with the woman he'd been cheating on me with, and that was that.
I still worry he'll be back. Get the occasional nightmare. But hopefully, that part of my life is over.
He tried to get me to go to mediation. I refused, based on his abusive behaviour, it would be very damaging to me.
Do you have any funds for advice from a solicitor? Or maybe CAB for free advice.
Wish you lots of luck xxx