Hi garlic, please feel free to ask away, anything I can help with I am more than happy to try. It's such a huge learning curve for all of us, especially when battling with everyday people as well as health professionals.
Well done for getting through my posts on poppycats thread! Like I said in her thread though I don't get the chance to come on MN everyday (because I spend hours here when I am on!) so please feel free to PM me if I'm not replying because that comes straight to my emails.
I ended up training the nursery staff about how to use the epipen, even though they had been trained, because like you I was worried they wouldn't recognise the signs. It took me long enough so I can't blame them. It was actually after a workshop by anaphylaxis campaign, and looking back at an episode where DD ended up in A&E and discussing this with the group that It became clear to me when to use the epipens.
Basically the main thing to remember is you cannot do harm by using an epipen, the adrenaline is at a dose that will not cause any harm when used inappropriately and it is very short acting so it has no long term effects (which is why you need an antihistamine and/or steroids to treat the overal reaction.) So if in doubt use an epipen, and I've really drummed that into the nursery staff too. The earlier you use it the more likely it is to be effective so use it before you even call an ambulance.
Any change in breathing including sudden voice change/change in the sound of their cry, sudden persistent cough/choking, difficulty or struggling with breathing, wheeze/high pitched noise when breathing, any sign of swelling of lip or tongue, these are all are signs of an anaphylactic reaction, even when not obviously triggered by food/eating. Older children will complain of an odd feeling in their throat/itching/lump in throat but with toddlers we were told they sometime start pulling or scratching their ear really hard because that's the closest they can get to that part of the throat. I know it sounds strange but I use to get an itchy/feeling of lump in my throat as a child whenever I had white fish and it use to make me want to scratch/pull me ears too because it's so uncomfortable. Obviously if your DS suddenly becomes drowsy or not right in any way (and you know best when it comes to this, you just know when your own dc is not right) that is also a sign of an anaphylactic reaction because it causes the blood pressure to suddenly drop and makes you feel very unwell.
I also use my DD's antihistamine (cetirizine) all the time, if anything seems not quite right then me or DH just give it to her. Antihistamines are incredibly safe ao it really doesn't matter if your DS even has it everyday. Cetirizine is better than piriton because it has a much longer action (24 hrs compared to 8 hrs for piriton) and although our GP is reluctant to prescribe this despite letters from the consultant, I just buy it over the counter for DD.
Also if you suspect an anaphylactic reaction and have used an epipen it is really important to lay your DS flat and raise his leg. The way I have managed this with DD is not to lay her on the floor because she's screaming or really upset after being jabbed with an epipen, but to lay her flat in my arms and keep her legs raised by holdiing one arm against her knees/thighs. This helps to bring the blood pressure back to normal and just this simple action has been proven to save lives in people having anaphylactic reactions.
If you can do the online allergywise workshop on anaphylaxis campaign, it really helps to show that you should use the epipen in all sorts of situations. They send out plastic pratice epipens when you sign up to the online course, although whe using the resl thing you have to use a bit more force than on the trainer pens. Also if you can go to one of their support groups they are so useful I'm going to one in October in covent garden, and there's another in November in heathrow.
I hope this is helpful and please ask anything and I will definitely try to be of help. I hope things go better at your nursery.