WOW M. I have no advice. I just cant believe (well I can believe it but it still blows my mind) that he is blaming you for wrecking havoc on his life. Because he decisions over the last few months have resulted in no damage to your or your children's lives.
Did you meet with the new attorney yet? I am not sure if there is any way for you to resolve this with him amicable if he continue with these accusatory emails.