hi, thanks for providing the brief history of you. since you are diabetic you should avoid icing. as icing is contraindicated in diabetes. you can ofcourse try taking hot water fermentation followed by which keep the feet above the pillow and do some slow ankle toe movements to improve the metabolism and remove the metabolic waste. also to add on that doing some simple knee exercises will surely help. you can take an x-ray rule out any possible fracture as well. Undergoing a physcial therapy session will surely help and medicine as advised by the physician for symptomatic symptoms like pain and swelling. also to mention that exercises, even though simple will help improve the metabolism and boost the immune system which will help the healing of any damaged tissue occur faster. with the grace of God I wish you a speedy recovery