What Causes Sudden Onset Of Swelling In The Uvula?

My 21 year old son, non-smoker, thin build, almost too thin had a sudden onset of massive swelling of the uvula about a month ago. The swelling closed his air way off and he was choking, went to ER., was given steroids and anti anxiety meds and CT scan showed nothing unusual. 2 weeks later it started to happen again. Went to urgent care, has been back to urgent care 3 times in 6 weeks, the last time they put him on penicillin for strep. He had blood work done that showed negative to all allergens tested for but very low vitamin D level and low level of testosterone. he has a lump in his throat now but not the same swelling as the uvula. OTC and Rx allergy meds are not helping. Now he s being referred to ENT but has to wait a month more than a month to get in, meanwhile the urgent care has ordered another CT scan. If the CT scan at the ER did not show anything why do we think another CT scan will? The medical bills are piling up and we still have no answers.