Gestational diabetes?!

I'm almost certain I have gestational diabetes. For the last few weeks every time I have sugar (syrup with pancakes or orange juice for example) I feel sick, also if I don't eat something right as I'm feeling hungry I get weak. Other symptoms are very fatigued, constant thirst and dry lips/mouth no matter how much water I drink. 
I'm 29 weeks and did my GD test 2 days ago and I'm fearing I failed.   
Do these symptoms sound like GD?