A 17 yeаr-оld mаle presents with difficulty breаthing that started all оf a sudden after eating lunch with friends 20 minutes agо at a local restaurant. He is breathing 40 times per minute with audible stridor and wheezing. His blood pressure is 88/30 with a regular pulse of 140 beats per minute. His SPO2 is 84% and his ETCO2 is 60 mmHg. What is the best overall treatment plan for him at this time?