Welcome to the forum
@Seamsamp25
Sorry to hear about your son’s diagnosis. As a parent it can be perfectly natural to feel guilt and worry - but as
@Inka has said, T1 diabetes is just bad luck, and you did well to trust your parental spidey-sense.
Hope your trip to the US goes brilliantly. +1 for the Frio. Though generally if there’s a (not too cold) fridge wherever I’m going, I just take my insulin buried in hand luggage, and put it in the fridge as soon as I arrive at the accommodation. But watch out for hotel fridges, in case they are set super-cold and could freeze the insulin rendering it useless.
In terms of getting your head around his T1, you might find these books helpful - they are very well regarded on the forum:
Type 1 Diabetes in Children Adolescents and Young People by Ragnar Hanas - as relevant for adults as for children!
Think Like a Pancreas by Gary Scheiner - A practical guide to managing diabetes with insulin
You might also want to register for the excellent Learning Zone (orange tab in the main menu), which is packed with bite-sized modules you can take at your own pace.
Good luck, and keep asking questions.