Feeling overwhelmed! Help!

So I found out Tuesday that I have gd. I hust got home from meeting with the dietitian and all I want to do is cry. I'm 19 this is my first baby Ill be 29 weeks tomorrow with my precious baby boy.. I'm not sure on what my numbers should be so if anyone has a general idea of what the numbers should be I'd appreciate it if you'd give me an idea. Also tomorrow is my baby shower so that's awesome too I don't even want to go anymore. I just need some advice on how to deal with this and not freak out.