Dear Rachel,
Everyone is right, get on a plane if you have not already and come home the laws over there are very vague regarding domestic situations and the local authorities do not get involved until it is too late, and Turkish family's do stick together no matter how much they console you, let your family know what is happening for your own safety it will not be a burden on them, they love you and would want you safe, the best thing to do is go to consulate let them know the situation they can help you arrange a flight asap they can be very helpfull in dreadful situations, if you feel alone you are not, this is not the time to think about friends you have lost contact with if they are true friends no time passed will change the way they feel about you and it seems you have quite a few friends here who care about you, this is the time to think about your safety and please remember you will not be able to resolve a bad situation if you are in a place that is not home to you especially in another country, go home you will feel more in control and be able to access the situation clearly and and if he wants to get abusive with you let him do it in your country and on your own turf see how far he gets, and remind him if you decide to press charges against him they will be upheld if he returns to the UK. Please remember you are a British Citizen and thus so have the right to be protected under British law so once again go to the consulate if you need help.
Please keep safe, keep in contact and go home.
Lots of love