My ds has high anxiety - he has asd and various other SN.
He attends MS with EHCP.
Today is year 9 jabs. He's been in a state if it's even mentioned and I didn't think he'd even get into the room.
So he went into hall and curled up on chair under his coat - his safe position he adopts when anxious. A supply teacher then announced for everyone to ignore him as he's attention seeking 
Why would anyone do that to a child they don't know - whether SN or not - plenty of people have needle phobias.
Luckily ds very amazing, kind, caring and compassionate school nurse noted his distress and held his hand whilst he sobbed through both injections and took him for a drink and to calm down whilst he continued sobbing for nearly half an hour.