My sister has developed itchy red welps over entire Body. Swelling in face and eyes and tightening in throat. Her husband found her on the ground in yard with eyes rolled back, head back, and gurgling sounds. He called EMS. ER gave her Benadryl, steroids, and referred her to allergist. She can t be seen until July. She does have epi pen now. She has no history of allergies, food or otherwise. Could this be a neurological issue? She denies bug bites or changes in diet or household chemicals.