That sounds really uncomfortable! I have ankle problems and occasionally will need to use a brace after I ride, but have never used one while riding. I'm not a doctor, but I don't see what the harm would be for you to try. The only concern I have is if you are jumping, make sure the brace has enough give so that you can keep your heels down. The brace you are looking at looks like it make have some give to let your ankle down but hard to tell unless you put it on. Have you been to a doctor for this yet?