dear frieind if you had not done any blood test for that high temperature, do atleast once to know the cause of high fever. although leg pain may be due to that high temperature you suffered,muscular pain from generalised weakness. analgesic like paracetamol or combination with ibuprofen will relieve the pain. also take multivitamins with methylcobalamine combination if pain is severe for few days. hope this answer will be helpful to you. for more queries plz don t hassitate to ask. get well soon.