My 7yo son began a rash July 12. Since then he has developed joint pain that moves around his body, a fever for 5 consecutive days including today, occasionally limps, sore throat, belly pain. The fever has gone up to 103. He has been to an ER three times, visited the pediatrician twice, had seen a rheumatologist once, and a family physician. They requested 5 blood draws, 2 urinalysis, 2 strep tests. He tested negative for ANA, celiac, strep, liver/kidney conditions, parvovirus, mono. Do you have any ideas of what this is? My son only has a Hx of migraines. Other than that, prior to July 12 he was completely healthy.