Hi
@Whiff64 sorry to hear you are struggling with coming to terms with your diabetes. It is still very early days since diagnosis and not at all unusual for it to affect your mood.
You don't need to make big changes to your diet or give up everything you like.
Managing your diabetes through diet and exercise without medication is a good thing for your overall health.
As you mentioned start with a small change then build on it.
I love chips but now I put 10 chips on my plate when I do have them. I fill up the plate with a good portion of chicken or other protein and lots of veg or salad so it fills me up and I eat the same meal as hubby, just less carbs.
If I only have an omelette for lunch (no carbs) then I will have a low carb protein chocolate mousse or pudding as well. The overall carbs is much less than I ate before diagnosis but I still get a treat.
These are just examples that work for me. Experiment a bit and find a way to eat that you enjoy but also helps you manage your diabetes.