ha ha we had the exact same thing at the hairdressers a few weeks ago. I took him to this lovely children's hairdresser in Crouch End. The lady was SO patient but he still had a screaming fit!
We tried toys, distraction (which does still work sometimes - so much younger than your ds) everything to no avail. I just had to hold him tight too.
And the doctors the other day - oh my god did he get upset.
With other kids for my ds, loud noises aren't so big a problem, it's the physical stuff - like if a kid tries to hug him or comes very close.
I don't think my ds is as well behaved - sometimes he gets annoyed and throws things in temper. He is very strong willed.
Re the HV saying he might be gifted - it's such a stupid term. What happened to everyone using plain old clever, intelligent or bright - not as pc I guess. I have to say I have done quite a lot of research into 'giftedness' for my work and your ds sounds very very intelligent from some of the things you have said (the plane being too heavy comment). Sensitivity like this is a side-effect of high intelligence (I am not just saying that - as of course there are lots of very clever kids who aren't sensitive and vice versa.)
With my ds it's too early to see if he really is clever and as the godmother of a child with quite serious special needs I count my blessings regardless.
You sound very sensible about all that rather than talking it up and you are so attuned to his needs I am sure you will be aware if for example when he goes to school if he isn't being challenged enough.
Well, I've ordered the book on Amazon.
Will post on here when it arrives and I've read it (that could be in about a year - sadly never seem to get much reading time these days!)
Anyway thanks for your fab post - really interesting chatting - happy to continue if you want to keep swapping notes although I haven't as much to offer as less experienced given ds younger