I've had a tongue ring. I have 4 tattoos. I've had an IV and shots.
In EVERY single one I've been pale, clammy, scared, stop breathing, shake and on occasion have passed out.
The difference is that getting a tongue ring and tattoos were me actively choosing to face my fear in a comforting setting with people that handle more needles in a day than some nurses do in a week or month.
The shots are never MY idea. They are thrust upon me and I have no time to get ready. Getting ready for my tats is a 4-5 month process.
It's called an irrational fear because it's irrational.
Hey, I'll catch snakes and scorpions but put a little ole spider by me and I'll scream like I'm in a horror movie!