Don't let fear of being alone hold you back. You are better off on your own than being in an abusive relationship.
A few months down the line - when you are over the shock, and when you are not spending 99% of your waking time going over it all - you will start reacquainting yourself with yourself. And you will like what you find.
When you live with someone who undermines your confidence and tries to control you, you lose sight of who you are and what you want out of life. To pacify and please them, you start wanting what they want. You try not to rock the boat and tread on egg-shells (terrible mix of metaphors!!)
Suddenly you are on your own - and overcome with a sense of euphoria & freedom, but also by fear and doubt. It's normal. This man has been telling you you're worthless and wrong for a long time. Of course you will have started to believe it. But time will heal and you will gradually regain your confidence.
You will make friends and renew old friendships. (You might one day meet someone good and kind with whom you want to have a relationship - but try not to make this the be-all-and-end-all!) You will rebuild your life and the hole that you feel at its centre right now, will disappear as you remember who you are and what you want.
One of my relatives said to me that guilt is a negative emotion - it uses up a lot of energy but achieves nothing. As you move on, try not to beat yourself up for the situation you're now in. It's really early days yet, you're head is probably spinning with everything you're having to deal with. It will get easier. And you will be happy again. (And when you worry about the effect of all this on your kids - well, consider the effect on them of seeing their mother downtrodden and miserable.)
You have a long slog ahead of you - divorces can take ages, particularly if your partner is uncooperative (as he may be if he was a control freak and now feels he has lost his power...)
On a practical level, take notes to meetings with your lawyer (so you don't waste time & money crying!) Jot down notes now of examples of unreasonable behaviour you have experienced. Keep a diary of any harassment you experience from now on. Try to get hold of important documents now and put them in a safe place.
PS If I sound like a dippy-hippy self-help author, I'm not. But I know from experience that leaving an abusive relationship is an empowering act, and that things can only get better. Good luck.