Does my girlfriend have hypoglysemia. she suffers from the following symptoms all the time and it is ruining her life as she cant work, drive or do much at the moment, its been going on 4 8 months now:

Symptoms
Headaches, dizzyness, sweat palms, weight gain (3stone in 8 months) ratty, confused, low blood sugar,

Blood sugar rises and falls very rapidly after meals and she struggles to keep it up. I have tested myself along side her and my blood sugar seems very stable in comparison to hers.

She is not diabetic, she has had numerouse tests the fasted her for 3 days and she never felt betta blood sugar was stable as anything. The then fed her on another test, bread and orange juice, 3 hours later her blood sugar was 2.1 ??

Any help please