Lolly, have you had a think about anyone you could disclose to IRL? I know your main friendship group feels off limits because of you all being mutually friends, part of a group, but is there one person, in or out of the group, who you think you could confide in?
How quickly do you think you could get yourself to a solo counselling session? Or, as a first step towards that, could you telephone the AUS support line number given earlier in the thread?
Have you taken any steps towards getting your ducks in a row? I know you're feeling like staying for now but, you've said you'll leave the next time you catch him abusing you (and he will, this is a when, not if situation); if it happens tonight are you ready to go? Do you have your own access to money and transport?
A lot of questions, and you don't owe me any answers, I (we all) just care about you and hope that thinking about these questions spurs you into action, or at least helps you when that time comes.
As others have said, I hope you continue to post for support - it is not you we are critical of, even if our posts come across with anger - our anger, rage, hostility, is towards your husband for abusing you.