My son (8yrs) has a severe tree nut allergy and we have had to use the epipen a couple of times. So far that worked to keep the swelling in his throat from cutting off his breathing. But if the swelling continued and he couldn't breath, and we didn't have access to professional help, what other measures should be taken? I have learned CPR but if the passage is shut from swelling are there means for opening the passageway? I have heard there are people who punctured a hole in the throat to allow air to move. Is this a real solution in a worst-case scenario? And how do you know when it is necessary?