Hi,
I had to go for tests last week and been diagnosed with Essential Tremor syndrome.
Ask them why you were giving you insulin after food, then a glucose drink.
I ask because that is not good for blood glucose levels, the insulin would definitely give you the 3.7 reading, so as a precaution they gave you glucose.
Your blood levels will be bouncing around like a rollercoaster ride.
This is why you are getting those symptoms.
Have they got a clue, which type you are?
What did you have to eat before the insulin and glucose?
Why didn't they do a reading at least an hour after the glucose?
Because of the diabetes and possibly some lack of vitamins deficiency has brought you to the point where you will require help to strengthen your bones.
Why the neurologist? Have they found that your nervous system isn't quite right?
Don't panic, at least you are getting hopefully some answers.
Keep safe