@appleUK I don't think you're imagining your symptoms
But I do think your blood sugar results are normal, so that's not the issue.
The reason I mentioned anxiety is that anyone can have that, and it can lead to a vicious circle of thinking about health issues and imagining the worst. That's normal human thinking.
You've said you've had diabetes, thyroid, etc problems ruled out, so if the symptoms are still troubling you despite your diet modifications, you could see your doctor again and request further tests for other medical conditions eg post-prandial hypotension, ear/nose/throat problems, etc etc (I just named those as examples).