Who can see my medical records?

I have found out that a person I know has been looking at my medical records and has been sharing the details with other people. I am going to make a complaint, but firstly, I would like to know who exactly in a hospital has access to my records. This person is an assistant medical secretary in urology. I haven't been to the hospital for years so there is no need for my records to be accessed at all, so what I am wondering is, is there a way of tracking what these people have been looking at?

Just so when I complain, it isn't my word against theirs and thy can clearly see they have been accessing my records when there has been absolutely no reason to?