gestational diabetes

Hi all! I've never posted on here before. I'm 24 I have 2 little girls (4&2). 27 weeks with a little boy. I've just found out today that I have gestational diabetes and that I'm anemic. I didn't have either with my last 2 pregnancies and I'm nervous. Any of you Mama's had gestational diabetes before? if so how did you deal with it as far as testing and diets. Also how big were your babies, did you have them early? Was labor difficult? Please help I'm a nervous wreck over here! Thanks in advance!