Is it just me as I find the fact strange that you are on mums net writing whilst you are waiting for the ambulance and your 3-year-old son is gasping, surely you should be seeing to him and calming him down, carrying out the checks any good parent would be doing rather than writing on mums net and then sitting there reading the responses. Your son's life may be in your hands.
Imagine if the paramedic stopped what he was doing and started writing on Facebook. I can tell you that if the ambulance staff see you texting and spending your time on your phone the safeguarding form will be submitted and rightly so.
You need to do your research on what to do in the case of scenarios at other times and be prepared because when it comes to kids you don't get time to start researching it. I mean instead of texting mums net you should be making sure he isn't choking, calming him making sure that relaxes and gets the support he needs to breathe rather than his gasping and panicking and preparing yourself for immediate action in case he stops breathing. You have 4 minutes and the average paramedic takes 10-20 minutes.
I can understand you may be panicking and wanting support but you cannot expect to get this from a forum if you can't cope then get help neighbours, other people that are around you and if you are not aware of the procedures then take this opportunity to start learning about dealing with emergencies and what to do so that you are aware of them if this ever happens again.
Normally the 999 operators will stay on the phone with you and they will help you do things whilst your waiting for the paramedics and if you are on mums net whilst this is happening then your not providing them with the attention required and you need to re-evaluate what is important having a chat or focusing on what is important because they can only help you if you are focused and tell them the info they need to know rather than your wanting to as seems to me provide a status report to your friends as that's focussing more on 'hey look whats happening to me' rather than what is important.