M.P.
Hi J.,
This is a bit contradictory to what has already been posted. My son is 14 months and like your son diagnosed with a peanut allergy through a RAST test. My allergist said to always administer the Epi first and then call 911 immediately afterwards. There is no harm in delivering the Epi even if you find out later that the reaction may not have been severe enough to require one. Benadryl is good to follow after the shot.
My husband and I make sure that our son has his Epi on him at all times and have anybody who is taking care of him watch the 5 minute video on how to administer the shot.
I am so sorry your son's diagnosis has been confirmed. Like previous posts have mentioned, it is very positive to hear that kids CAN lead a very normal life with this allergy. Best to you!