My four year old boy have swollen gland in neck since four months with symptoms having pain in stomach irregular bowel and viral fever had severe measles like rash gland swell upto tennis ball size that doc decided for biopsy but soon he had measles meanwhile he took antibiotic till three wks it did subside to one cm two wks back it again swell to 4cm again doc prescribed antibiotic still not subsiding doc declared allergy in gland whereas other doc said its redcurrant cervical lymph adenitis please help...