Husband giving threats of divorce and suicide

I have been married since 4years, was a working professional. Later was made to resign from job. I conceived and had a daughter - just after delivery my mother in law came and kept accusing me of many things, including not letting me feed the child, and did a lot a mental tourture during her stay of 5-6 days. Thereafter my husband stopped going to work, later resigned and lied that he had been laid off. I had even been accused of not letting my husband join the family business (but that was never a issue then). I gradually became a victim of PPD. Took me quite a long time to get out of. And soon managed to get a job. 2 years passed - Husband was jobless. Then I gave in to the idea of the family business.. There at his parents house - I would be routinely haunted for giving my earnings and savings to grow Husband's business, a lot of blackmailing and ill treatment I received from them. One day I finally managed to move out of the situation as it was taking a toll on my well being. Since the past 2 months - He is sending me divorce and suicide threats. What should I do to protect my daughter and my self.