The doctor will only see that your hypoglycemic in a blood test..if at the time of the test you were experiencing hypoglycemic symptoms which it sounds like you have.
But it is impossible for a doctor to diagnose you with it unless they have actual results. Especially with hypogylcemia because they don't know alot about it. There is only the one test I am pretty sure that shows your blood sugar levels and if you are feeling ok during your test than it won't show.
I was born with hypoglycemia but the symptoms didn't get bad until about grade 3. The doctors my whole life told me I was perfectly healthy until I was about 18 and I had a test taken when I was actually feeling the symptoms. Then it showed I was hypoglycemic. But still doctors do not know enough about it yet. So your best bet would be a naturapath and online I think.
I had the test in the morning right after I had eaten hashbrowns, eggs and toast with water. maybe 20 mins after.
It is harsh but if you want your doc to know whats going on. You have to get him to test you when you feel like hell..then he can see what is happening in your system. If you can, get him to check for anything that could be causing it at that time because you don't want to have to go through that again for a whole new test.
Vina