Hi
@Claire-marie108, and welcome to a very exclusive club.
I would agree with all those who urge you to keep a diary of your blood sugars before eating, what you eat, and your blood sugars two hours after eating. You’re already seeking control by looking at your blood sugars and your reaction to them which is fantastic.
I’m going to make a suggestion that might prove to be just too much right now so if it makes you want to run for the hills, snow or not, then ignore it! There’ll be plenty of time for it later.
Suggestion
When you record what you eat it’d be very helpful for the DSN if you tried to work out the carbohydrate content of your food. This is not always easy straight away so listing everything and the carb amount for the things you can work out will be a start. There are websites and apps that help too, I use one called Carbs and Cals though I ignore the Cals!
This may also take some time to begin with and it helps at this stage if you have food where the carbohydrates are listed on the packing. You’ll need scales that measure in grams so that you can use the information on the package. This is usually given in the amount of carbohydrate per 100g so a calculator might make it easier. Weigh the food, for instance bread, rice, potatoes, pulses, pasta, etc. and use the total carbohydrate in 100g to find how much there is in what you’re eating. Some things are very high in carb so it’s probably a good idea to avoid them at the moment.
If you make a note of the grams of carbohydrate eaten and blood sugars before and two hours after eating then Your DSN will find it much easier to calculate the amount of bolus (short acting) and basal (long acting) insulin that you should take at this stage. She should give you lots of information about the thing to do if you find that your blood sugars rise or fall too much too. Ask her to explain how you should respond to hyperglycaemia (high blood sugars) and hypoglycaemia (low blood sugars). For the latter many of us have a handy stock of glucotabs and jelly babies that we have on or near us.
End of suggestion, phew

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It’s all a bit of a shock to begin with but with any luck you’ll begin to feel physically much better soon. And the suggestions I’ve made about the carb should soon become something that’s less and less taxing as you get used to it.
We’re all different in the way we react to having diabetes, but we all share the desire to understand how we can control it. The more you know about the way you can control your own, the more it’s likely to just become one of those things you carry with you and not a burden you drag behind you.
Don’t hesitate to ask for medical advice, especially at this stage. And if you’re unsure, ask them to explain why they suggest one thing or another. Ask what they’d do if they were in your place.
Some of us have enjoyed the company of Type One Diabetes for many years, some of us are new to it so there’s a wealth of experience here on the forum, and for us no aspect of it all is too silly, too upsetting, too surprising, too funny or too puzzling to discuss here.
Again, welcome!