"Tired of waiting"

I am waiting for a replacement knee operation but seem to be getting nowhere. After 4 years of being passed from physiotherapist to hydro therapist and being told that my x- rays showed nothing I was finally given an MRI scan which revealed that I needed an operation. Initially I was to have my knee cleaned, which was done in January this year after 2 cancellations. When this didn't rectify the problem it was agreed in May that I needed knee replacement. I was told that there was a 3 month wait for the operation, which would take me to August. As I had heard nothing by the middle of August I made contact with the consultant's secretary and told them that I had a holiday planned for September. They said that a note would be made of my holiday dates. I did not believe that it would not affect my place on the waiting list. I actually thought I had helped by advising of my holiday arrangements. At the beginning of October I rang to ask if there was any news about my date and was told that I was not on the October list but may be on November's. I called again today and was told that it was not possible to give me any idea of when my operation would take place but I agreed to go on the list for a cancellation. It appears that I have been penalised for giving dates when I would not be able to have the surgery. I feel that I am getting nowhere and my life is now on hold. I can't plan anything and my husband has had to save holidays from work for when I get home after my operation. He is being asked to confirm dates at his work and will lose the holiday days if he doesn't book them before December. I just need to know what is happening.