My daughter's had a low fever on and off since Friday. Today she can't walk. When she tries to stand, her calves are in severe pain. The first time she tried she screamed. She shuffled her way down the hall to the living room but was in tears the whole time. Her legs dont hurt if she's sitting or laying down but she cannot put weight on them. I've called the doctor and we're still waiting to hear back. Anyone ever experience this?