I think you've pretty much covered it. And yeah, making lists and notes helps, because it gets overwhelming and after a while you get a little cross-eyed trying to remember it all. (Until it becomes second nature, which happens sooner than you might think.

).
To put a few things straight: the term "healthy diet" is very much open for debate. What
is healthy? Plenty of fruit? Because that's high in sugar, and the vitamins don't compensate for that if you can't process them. Low fat? Because that's what's been hammered into us for the past 50 decades or so. (Before that, diabetes T2 did happen, but not in the pandemic proportions it's going around now!). So, a healthy diet? Guess it comes down to what is healthy for each individual person. You have a metabolic condition, so you're better off limiting carbs. Cutting them out entirely is hard. I know, because I've more or less done it. (Almost zero carb, on a carniviore diet. If I have carbs, they're in my cream). There's some foods that are better to just cut entirely, others you can go for in moderation, others you can go to town on. Try to focus on the things you can have, because there's still plenty of options for you. Even when going to McDonalds, believe it or not.
It's almost unavoidable to not be a bit obsessive at first, because you have to take so much into account around a meal, but that passes as you get used to think and don't ave to measure every meal anymore. And as for low in mood, well... I think you'll perk up if you see the positive impact your changes are having on your blood sugars. That meter's going to be very motivational for you, I'm sure.
You're off to an excellent start and you've got a good grasp of this.... Better and sooner than I did! You'll be fine.
Jo