I cant really add much to what has been already said, but please call Shalom Task Force again. Dont let your resolve from last night fade away.
DO NOT blame yourself. Everyone is responsible for their own actions.
IGNORE every post saying “I think your husband has this problem” or ” Your biggest problem is this..”
Call STF and get professional help. Go see a doctor/psychiatrist who can prescribe medication IF deemed necessary for your PPD. You should also seek out a psychologist to help you overcome the PPD.
BUT most important of all, call STF and let them help you. (Unfortunately) They have a lot of experience with these issues.
My heart goes out to you. May Hashem help you survive this terrible ordeal intact.