My son, 14, has an allergy to corn. It is really a pain as there is corn in everything. He has done well with his allergy with no breakouts until this week, the week we leave. I have taken him off corn completely but have now decided to bring the epipen just in case he has a bad reaction to something that has corn and we don't know it. Do you think I'll have a problem carrying this into the parks? Do I need a note from his doctor?