Sorry if this is repeated but lost my original post.
Anyway I think you sound like a great mum who has spotted a problem that needs tackling head on.
My dh is needle phobic.
Not just a little bit, but full on can't talk about, look at , or even think about needles without reacting very badly, flat out faint, panic attack, massively stressed.
It has been life changing for him, it affects all the choices he makes about his health, his dental health even where to go on holiday.
I work in the medical profession, I handle needles all the time and before I lived with a needle phobic I had very, very little patience, very little understanding how out of control it is.
This is not a men are all wuss, women are tough problem, it is a condition that can so easily be pushed to one side but as the years go by it will affect his health and the decisons he makes.
Go talk to your GP, see if there is any therapy that can help. Dh has had cognitive behavorial, hypno therapy, the lot. We finally found a dentist that got that he isn't frightened of drills or pain and will have fillings with no pain relief, but it has dramatically affected his dental health.
It has limited his travel options, even changed his career options, it has limited his life choices.
Do not sweep this to one side , it doesn't get better if ignored, but it is easy to ignore the issue and just not face situations where needles are needeD.
Well done for spotting that it's growing as an issue and that it will affect your ds.