Unless you are as abusive as he is, he cannot be said to be your 'other half', can he?
I've got so much other grief going on atm I cant sort everything at once, I feel drained and barely able to function doing normal stuff without making huge decisions on top
Binning him is not a 'huge' decision; it's a logical decison which will vastly improve the lives of your dc and free you to concentrate on the everyday necessities and the people/worries/situations that really matter.
When has he been supportive and done what he could to alleviate some of the pressure you may be under? When did he last take you out to dinner/cinema/party/pub? Treat the dc to a day out? Buy them small gifts? Buy you flowers, bring you chocolates and other tokens of his love for, and appreciation of, you? How often does he tell you he loves you and can you see the love in his eyes when he does so?
What did he buy you and the dc for Christmas? Did you spend it together and did he contribute towards food and drink? Where did he take you on Valentine's day? Did you go to a restaurant or did he cook a romantic meal for you? Has he planned summer outings and/or a holiday so that he can spend quality time with you and the dc?