Hello. My name is ***** ***** I will be happy to assist you with your questions. First of all, I am very sorry for what you are going through. I cannot imagine how distraught you must feel.
Your primary, and advisable, option is to go personally to the police station. If you have no transportation, then call 911. If your husband still has your phone and won't give it back to you, ask a neighbor or anyone else to call.
The police must respond immediately by (1) arresting your husband and (2) having the court immediately issue an order of protection. Without knowing all pertinent details, it appears to me that your husband could be charged with assault and child endangerment (not to mention petty theft for taking your phone). An order of protection should require your husband to stay away from you, your house and your workplace, as well as prohibiting from contacting you.
Do you live with your mother-in-law? If so, you may still be able to get an order of protection against her. In her case, though, the order may not require her to leave the house if it is her residence. Your husband, on the other hand, would have to leave. These orders are typically effective for 30 or more days, and are renewable. If your husband violates the order, by visiting or even just texting you, he can be arrested and charged with contempt of court.
If you live in your own house, you need an order of protection against both your husband and mother-in-law with maximum restrictions on their ability to contact you or your children. You should also ask the police to refer you to any local domestic abuse assistance service. Such services are often provided by local law enforcement.
The Austrian embassy would not be of much assistance here because only the State of PA has jurisdiction over a domestic abuse case such as this.
Please be safe and strong. I hope this information is of some use to you. Please let me know if you have any further questions. Meanwhile, I wish you good luck and peace.