My 7 year old son got stung by a yellow jacket in the leg 2 weeks ago. Two days later, a large red ring appeared on the other leg. Took him to the Dr. Dr. said the sting site was infected causing an allergic reaction on the opposite leg. Prescribed oral antibiotic (Keflex) and cream (Cortozone). Three days later, a rash appeared on his chest and back. Back to the Dr. Dr. said allergic to Keflex, discontinued. Said red ring could be ring worm. Prescribed anti-fungal cream. Two days later, vomited all day and into the next. One day without vomiting. Vomited again last night. Red ring is gone. Has complained of headaches since bee sting. Need advice, please help!