My 6 year old son has been experiencing the following symptoms: •High fever that lasted 2-3 days, returned a few weeks later •A week after the fever he has complained of joint pain in his ankles and unable to walk, this disappeared after a few hours and then returned again a few days later •He has blood and protein in his urine (no visible blood-just positive after a dip stick) •He is more tired than usual and appears lethargic - school mentioned that they have noticed this too.