gestational diabetes

So today I had a call from my Hospital to advise me after my recent gestational diabetes test on Friday I have in fact got gestational diabetes, my mind has now shot in to over drive and I just can't stop worrying I watched my mum get gestational diabetes with my youngest brother now 11 it was horrible she gave birth to him 6 weeks early weighing 12lbs 10 I'm so scared the same will happen to me she's now type one diabetic and my brother is monitored monthly. I'm currently 29 weeks and my little girl is measuring at 2.8lbs has any one experienced this and have any advice ?