Diagnosed with Gestational Diabetes

I’m 29 weeks and was just told by my doctor that I failed the 3 hour glucose test. I now need to stay away from sugar and track my sugar levels. Are any of you mommas going through this? If so, could you share some tips. I still haven’t gone in to see a consultant but in the meantime I’m trying to take care of myself. I’m just not sure on what I can eat or snack on. I feel like everything is bad. Thank you!