Well I have tried several knee supports - variety of flexi tube thingies and one which was the same but with a hole at the front over the kneecap and neither helped at all, in fact I would say made it more painful.
Have also tried "taping" as done by physio - just micropore stuff but stronger, stuck around whole knee in stategic places supposed to pull the knee into position and steady it and that was useless too.
Only thing that has helped me a little is actually the shoe inserts I have from podiatry dept as it seems the Hypermobility has led to me having one leg shorter than the other as has affected my hip position. Also the dodgy knee makes me roll my foot in and I have ankles that tilt inwards.
Would it be worth requesting a podiatry assessment? I have seem all sorts of docs about my knee and these were the first people who have made any difference at all.
Other than that I would reccomend regular use of painkillers as prescibed by GP. I used to struggle on and only take them when pain was keeping me awake but after a chat with my GP now take them before it gets to that stage and it is a lot better.