Also today, finally the physio got in touch with me. It is bloody hard getting through to them as it has taken me 4 attempts, but they rang me tonight. They asked a few questions and she seemed to agree with the doctor's idea that it could be a torn cartilage in my knee. So I have made an appointment to see the physio but it is on March 13th at 10am, so I'm gonna have to take some time off work but I really want this sorting out as it has been going on since June last year! Fingers crossed they can sort it!