Apparently the collaborative process is not working for you. Consult with an experienced divorce lawyer to represent you.
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If he is that hostile, collaborative law doesn't seem the way to go. You're of course free to raise these concerns to the collaborative law attorney. But you're best advised to schedule a consultation with your own NYC Divorce attorney.
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Under those circumstances you probably will do better with a litigated divorce.
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Your collaborative lawyer should be looking out for your best interest. If this is mediation, you can always hire a lawyer to attend with you or advise you in between sessions. Generally, I believe that parties get the best deal when they work together to come to an agreement without involving courts. But if that isn't happening here, don't let yourself feel forced into something just to "get it over with." Contact some lawyers and see the various options you might have available.