Wise words from @AcrossthePond55 op.. and I agree with the pp who said move it to a health board.
Its very hard when you are suddenly faced with a diagnosis of a chronic illness whether you have to change the way you eat or not.
You've only just had the test and you are probably still unsure what it means for the future, what its really going to amount to on a day to day basis, and its bloody horrible dealing with that. Even the most practical and down to earth person who thinks they can deal with anything can find themselves swamped with big emotions..
And I think this is what is going on here. You said you'd been very stressed, and its always stressful getting everthing organised for a holiday. Plus you've had worrying appointments. Maybe not enough information from the testers. You might be able to contact PALs for more information if that's the case. There will be plenty of people who will be able to tell you that they can manage it and slot it into their lives, without having to be different to everyone else, and you will get there too.
It's also harder to embark on major changes when you are not in your own home/kitchen and reliant on working out what's what in restaurants. It can feel quite isolating, especially if people around you don't get it. The pp who mentioned trying out chat gpt for ideas of what you can safely eat, particularly in the location you are in , would be a great idea. I found that really helpful when I was in a country I'd never been to before recently, where it was much harder to find the right things. Focus on what you currently know you can eat and have as much as you want so at least you don't feel hungary. Can you go on any special trips to distract yourself, or a spa or something that makes you feel more relaxed.
Its one thing to be making voluntary dietary changes..(fad diets as my DH calls em) It's quite another when eating the wrong thing, even by accident can make you feel really ill.
Can you have a talk with DH about how you are feeling? And your DDs and just explain that you are trying to find your way... I'd forget about whether they are eating "healthily" on holiday or not. Plenty of time to look at that when you get back.
Wishing you all the best x