Call your local police station, not 911, during business hours. Tell them you plan on breaking up w/your boyfriend, an active alcoholic who has choked you before. Tell them you have a child in the house. Give them your name and address and ask for their advice.
Then tell your AB, before you break up w/him, that you already talked to Officer X, and if there's any trouble, they are ready to come assist you and your daughter.