My son injured his calf muscle during training about 2 months ago. I brought him to a physio who treated him and gave him exercises. The calf seemed to be better only he went back to training 2 weeks and his calf is very sore again. We have been icing it and stretching it to no avail. What should I do next. By the way he was treated for Rhuematic fever 2 years ago and will be on penicillan until he is 16.