Reactive Hypoglycaemia after childbirth

Hi everyone, im new to this site, six years ago after childbirth I became very unwell with all the symptoms of reactive hypoglycaemia (which i wasnt aware of at the time) I got a blood test at the docs who said my thyroid was fine and that was it! I came away very upset that this had come out of nowhere i'd been fine all my life......I saw a nutrionist who said it was obviously react, hyp...I found it helped sticking to a carb free and sugar free diet and eating every two hours however I do get very bad flareups when I go back to carbs and sugar....Has anyone any idea of why this could of started after childbirth?
I've put up with this for six years and have not booked an appointment to go through private healthcare but would love to know if anyone else has heard of this??