Gestational diabetes. Help!!!

I just got a call that failed my first test. Have to go back on friday for a 2 hour test. I feel crushed. Already have so much on my mind and i fear this will bring with itself more appointments, more picky eating and etc. I dont take sugar, dont like chocolates, do eat meat once a week, and i cant wrap my head around why i failed my test. Wo der if it is the rice, noodles and irish i eat with vegetable source.

With my first, i didnt have GD, But baby was born with 10.7 pounds (4.86kg) and they immediately tested him for GD, and i had to take another test 2 months postpartum, we both were negative. This baby was big too at my organ screening and they suspected GD or an infection. I tested for infections and i was negative.

I was 106 pounds (48kgs) pre- pregnancy and am now 130 pounds (59kgs)

Can anyone share with me their experience with Gestational diabetes? What should i expect?

Was told not to eat cabohydrates and sugars on thursday and not to eat after 7pm. Do you have tips on what i can eat thursday? With my first test, i did eat rice the day before but last meal was at 6pm.