Replying to Swollen ankles and ski boots

Alright so about two months ago i broke my ankle and got surgery with 7 screws and a plate. Now the bone is already 100% percent healed but the muscles and ligaments are still all stretched out and my ankle is super swollen. Ive rode probably ten times this year and after about ten runs my ankle is in unbearable pain and i need to take my boot off for close to twenty minutes. Right now i have these crappy size 30.5 salomon boots. Can you guys think of any way to prevent this? Ive heard of heat molding but i have no idea what that is, would that help maybe? Any ideas would be sweet. THANKS!!