Big swing related Calf squash

Yesterday all five us went to the park, and all five of us managed to get onto the big swing. We managed to get some momentum going, and then I made the mistake of trying to stop it with my right leg. The movement buckled my foot backwards on itself, and the weight of us all crushed my calf. So today I'm still still in a lot of pain and limping badly, and can't drive. Huh. Olly.