26 weeks and GD?!

Hey ladies! I'm currently 26 weeks pregnant and have had multiple fainting episodes accompanied by remaining unconscious for a few minutes. I've been to the ER 2 times now, finally they told me I'm anemic. Told me to have a high protein diet, drink plenty of water and go take a iron pill. 

I'm having my glucose test in 2 weeks. What are the warning signs of GD? Could I maybe have GD? 

* I'm only looking for positive advice. Or any stories about GD/ fainting episodes. 

Thanks ladies!