So sorry to hear your boy is going through all this pain. Especially during his time off. I do not have little ones with it, although I did have it myself (very badly) growing up. I would ask my Mom to "chop hit" (kind of like what I have learned since resembles meridian/qi gong tapping along the meridians) my legs up and down so I could get to sleep. Cold therapy helped me too. I am sure treatments/management have come quite a long way since then. I find TCM and acupuncture probably the most effective at managing pain that western medicine hasn't really figured out yet, so I would recommend this first and foremost. Call around and ask which ones use electro acupuncture for pain, which I have found very, very effective for leg pain in particular.They work along the meridians which I found as a child, effective, although short term. As you mentioned, adequate rest is important. I remember my legs recovering from just a few hours of ice skating for days. I've heard really good things about applying and massaging MSM (in a gel/lotion) into the affected areas.