Anaphylaxis

I thought this article had some interesting information about using an Epi Pen. We've only had to do this once and I REALLY don't want to do it again. My greatest fear about this is, I won't use it when we should've or soon enough and it will lead to disaster. I guess I need to clarify with his allergist. Fisher gets welts often from food and this article leads me to believe that the Epi Pen should be administered if this happens. Hmmmmm.... Anyone out there have experiences they would like to share?