Hi Judith,
Are you on any meds?
We can't diagnose you, but we can give advice on what to do, if you are indeed getting those types of readings.
6.3 is a relative normal reading.
If after two hours, your reading is in hypo range, below 3.9, and are getting hypo symptoms, shaking, hunger, craving, feeling awful and of course dizzy.
I would have a look at our forum, called Reactive Hypoglycaemia.
There is loads of information on the threads and from there you can ask all sorts of questions. Ask anything you like even if it sounds weird, we do weird!
Hope you are feeling better.
Best wishes
Nosher