Afternoon @Crazymonkey. It seems as if it is a long time since your first post and that things don't appear to be getting better. You are having difficulties with your right knee and with getting help, your age apparently not helping.
Here is a link to some information on OA:
You shouldn't loose faith with the doctors. They see a great many people with the same problems as you. I have been surprised at how much help I have got from an apparently very cursory consultation. Persevere and I am sure that you will find help.