Anaphylaxis Scenario (Tech)

You are working as a double Technician crew on an EA when you are called to a 26-year-old male park runner who has reportedly been stung by a wasp and is having an allergic reaction. You arrive at scene and the patient is sat on the floor, there is significant swelling around the face and neck with hives and reddening of the skin. You note a very audible stridor. The patient seems in significant distress and is struggling to get any air in.