Aahhh sis, this is heavy, and honestly, this isn't really about motherhood advice anymore, kundi about you and your future.
Please talk to someone you trust, a counselor, social worker, or even your closest mum friends, because what you're describing (financial control, emotional distance, threats to remove you, no partnership in parenting or life plans) is serious stuff that goes way beyond the baby. You deserve support na hindi lang tungkol sa baby, but about you as a person.
Your son needs you happy and safe more than anything else, sis. Kaya naman before you decide to stay or leave, please reach out to a professional or trusted elder who can help you think this through clearly, may crisis hotlines din sa Pilipinas if you need someone to talk to confidentially.
You're not alone in this, at it's okay to be scared. But you deserve better.