Without medication

If I have been on long term medication including a controlled drug in the uk, how difficult is it to obtain this when registering with a doctor here, I intend to reside here next year, I am currently here until 7th January and stupidly I accept miscounted my medication, I went to pharmacy who would only sell me 1 x20 tablets, I had my uk prescription to show this would only last 2 days, I was told to go to Medical Centre, I went and appointment was made for the following day, the doctor I saw basically showed me the door and told to get a translator but then said without history then no prescription. I am here completely on my own and frankly was a blubbering mess. Is this simply a case of naivety on my part . What I can’t understand is if they can sell one packet why can’t they sell any more when I have proof of the precise dose?