Hello. My 3 yr old daughter has been running a feve for 4 days now. She also gas had a cough . We took her to her dr ne day two and he Placed her in amoxicilin . She still has low grade fever being contained With alternates of tylonol and ibuprofen . Now for the question...she began complaining of very sore legs throughout The night. As of this morning she cant even walk on them. Pain seems To be in het lower legs/calves. Our doctor is closed for the weekend. Is thus serious? What could the cause be? Should we take her to a walj in clinic or even the ER? Thanks for your help