I really need some urgent help please

I don’t know where to start but please no judgement. I’m from the U.K. but I’m currently in Tunisia with my eight month old son who was born here. My partner is abusive otherwise I would never take a child from his father but I can’t take it anymore and I’m at breaking point. Always crying always upset and I don’t know what to do as I’ve no family or friends to help. I’m completely isolated. I want to return home to Scotland but obviously my son doesn’t have a passport and the British embassy here haven’t been of any help the people are so rude and I don’t know where to turn. I have no funds in my bank account to apply for a British passport for him and I really need help of someone could find out if there’s some sort of emergency travel document I can get for him. I don’t know what to do and I’m alone. I need to get my son out of this situation please someone help.