My 12 year old ds suffers from incredibly painful heels after football, and has done for a while .We've tried putting memory foam insoles in his boots, but it only helps a bit. It was the worst it's ever been after training last night and he had to stop playing, which means it must have really hurt. I've made a doctor's appointment for next week, but he has training and a match he won't want to miss before then. Does anyone have any idea what it might be, and what, if anything I can do to ease it a bit?