I feel sick to the stomach

Sorry, I don't know where to post this or which topic it would come under.  I was expecting a phone call from the MH nurse today, but an hour later no phone call. Last week I was expecting a phone call from the Practice Nurse, but no phone call. I assumed then I had the wrong day or she was off work.  I thought when the MH nurse rang I would politely ask if had I got the wrong date as I forget appointments all the time if they don't text me with a reminder.

Anyway I decided to ring the GP surgery and I said the MH nurse didn't phone me, they said you're not registered with this practice. I said I was but they said no you're not you moved to a different practice. I said  I hadn't moved anywhere, so they said they would ring me back. They rang back and said yep you have moved doctors, to which I said again, no I have not. I have not registered with any other doctor, I haven't even been out of my flat.  They told me my files had been sent away, but didn't tell to which doctor or where. I was quite annoyed, I reiterated that I had not moved practice and that perhaps they accidentally transferred my files to which they replied, we cant do that the files would have to be requested.  

They are investigating, they haven't rang back yet although its been over an hour. Now I have this awful sick feeling in my stomach that someone might be using my id to register with a doctor and they might be able to access my medical notes via the NHS app. I don't know what to do or who to make a complaint too, but I think its unacceptable that my files and my doctors have been moved with out my knowledge nor consent.