I was diagnosed as an adult just under 40 years ago now. I found out when they did the medical for a scholarship abroad - to a country where I didn't speak the language very well and pretty much no one spoke English. Then I ended up in umpteen different countries over the years, with very variable and not very good diabetes care for a lot of it.
It meant having to figure out everything pretty much on my own and was a VERY steep learning curve with quite a few mis-steps along the way.
First off, it does get easier as time goes by. You get more experience in carb counting/estimating and get to know better how your body reacts to everything.
Random thoughts, first off particularly for going on holiday.
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If you don't already do this for travel, make a packing list!
I have one I wrote about 20 years ago, printed out and still in use. I tick things off in pencil to make sure nothing is missed, then erase it later to reuse the list. Its in three parts: diabetes stuff (the only one I regard as crucial), always need stuff (like underwear etc), and one that is specifically for winter vs summer travel.
For the diabetes stuff I calculated how much of each thing is needed for a week (including sweets to bring up lows), and that is written on the list so I don't have to recalculate it each time. When you pack, take TWICE what you calculated and then a tiny bit more.
This might seem over the top, and you can probably reduce the extra if your holiday is not too far from home, but you never know what can happen. I was stuck in India for a week longer than planned when 9/11 happened (was living in the US at the time) and all flights were cancelled. And I was in the Netherlands when there was a volcanic eruption in Iceland and again all flights were cancelled...
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If flying, all diabetes supplies with you in your carry-on and don't let it be separated from you for any reason.
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If you are eating in a restaurant, don't take your insulin until the food is actually in front of you (unless there is already bread on the table!). Yes, that goes against the rules of good blood sugar control, but you have NO IDEA how long the food will take and how many carbs will actually be on the plate and the risk of going dangerously low is just to great if you inject in advance.
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In a restaurant, try to order dishes where the carbs are more easily seen and thus estimated, and are not too large a component of the dish. The lower carb it is, the smaller the amount of insulin you need to take, and therefore the smaller
the likelihood of going dangerously low or unpleasantly high. For example, something with potatoes on the side = relatively easy to see and estimate the carbs. Plate of pasta or risotto = a huge amount of carbs and who knows how many.
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Maybe this is just me, but try hard not to compare. Not with other people, and not with how things used to be for you.
This is actually advice for all the time, but particularly on holiday, everyone around you will seem to be without a care in the world. Eating, drinking, exercising or whatever while you are having to calculate things and deal with shit that they are not.
Remember, many other people have struggles too, but you just don't see them, just as they don't see yours.
If their life has particular struggles, they are likely to not be out and about, or be unable to go on holiday at all, so you are not even seeing those whose life is actually more difficult.
For example, over the years I've known a couple whose child stopped mental development at about 6 months of age. He's around 30 now, cannot of course speak, is still in nappies, and has the strength of an adult. I don't think they have ever been on holiday.
I also knew someone who died of a brain tumour in his twenties, have a cousin suffering from Huntingdon's chorea, and the list goes on. If you MUST compare, remember also to compare with those who have it worse, not just those who have it better.
Finally, friends and family will NEVER fully understand. The only people who really will are others with Type 1. If you can find any kind of real life support group it really does help.