Picking up a thought triggered partly by your recent post "Libre 2 query"
@Coanda_24, along with remarks within this thread ...
When you have periods (a day even) of negligible food because you don't want anything to eat, then that can cause your liver to dump even more glucose regardless. I think a layman's explanation would be your brain constantly demands glucose specifically; it doesn't matter to your brain whether that glucose has come from carbs you've eaten or proteins and fats you've eaten that will be metabolised into glucose in the absence of carbs. Or just glucose released by your liver store, or ultimately glucose from muscles and existing body tissue. Our brains will grab glucose from wherever it can and at the expense of other bits of us, in extremis. Thus you can still get glucose releases without eating anything.
So I wondered if those BG surges you've told us about earlier, even when you haven't actually eaten, were being caused by internal glucose releases. A further factor is that the brain is the one bit of us that does not need insulin to help transfer glucose from blood to cells. We tend to not know when the brain is working hard and drawing glucose out of our blood; if we are exercising or physically active a circumstance has taken place that we know about and can use to explain something to ourselves. We are generally blissfully unaware when our brains are working hard!
There are so many things that can affect our BG that it can be really tricky to see the wood from the trees. It is why I was so impressed with your Practice Nurse deciding to give you a Libre 2 (and now for the time being continuing that help). Your symptoms and circumstances are confusing - and one BG factor may be overwhelming another; recent posts sound unduly complicated, possibly because 2 factors are mixed together and its not so evident about what is causing what. So extra visibility from Libre makes so much sense. In theory you might get a reasonable view from frequent finger prick tests - but so much easier from a CGM graph. I reiterate my non-medical thoughts that, because you are most unlikely to go hypo, I don't believe it is important to get readings continuously from one fortnight to the next. The big thing for me would be to identify possible explanations if at all possible, try to explore those methodically and thus eliminate each possible explanation (or not as appropriate). Within that methodology try and monitor just one thing at a time; so try not to introduce more than one variant at a time. If you change a parameter, such as type of meal or a certain level of activity, let that run for a couple of days and see what that tells you - if anything. And so on. I do understand this is not simple. In real life "stuff" intervenes.
Anyway, I am not any sort of expert on this and my thoughts could be totally off track. Good luck.