The MC is going to take time, and your H won't change until he's ready to admit he has a problem and realizes how he hurts you. Only you can decide how long you're willing to wait for that to happen. HOWEVER- If your safety is at all compromised, then there is no decision other than to get out now. Also, as someone pointed out to me in my situation- what kind of relationship and behavior are you modeling for your kids? They are watching, after all. And they see more and hear more than we realize.
My other thought is to make sure you continue counseling for yourself even if your H discontinues with the MC. Maybe the IC can help you 1) how to avoid falling into a pointless argument trap; and 2) discover other ways of communicating during an argument so that you don't feel any regrets afterward over the way you handled yourself. Those are good skills to have no matter if you're dealing with H or somebody else.
