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Thanks guys, but no, they don't make you go back through if you set it off, you just get a hand search - i had two!
This isn't something that has happened for the first time and could be something else entirely i.e. post holiday infection etc., he has had these issues for over 10 years now. He has been for tests and they haven't found anything, but his symptoms have lessened as we've learned to avoid the triggers. I have contemplated that it is maybe all in his head, but the physical symptoms are very real, you can actually see him change colour - it seems to effect one side more than another, so for example if he wears a tshirt that doesn't agree with him, one hand and arm goes very pale and he gets a buzzy feeling and ringing in his ears and when he takes it off, he returns to normal. He cannot have dental xrays and sometimes finds that sleeping with his head next to a wall can effect him too.
Its a bit of a nightmare really.
Thanks for the tip about the pacemaker though, i'l look into that and see if that might be something valid to try.
We are honestly not terrorists or smugglers, just a normal family trying to have a holiday :)