Acid reflux question

I am in need of advice. I am 11 weeks 3 days pregnant. I have suffered with GERD well before pregnancy, including a hiatal hernia which doesn't help. I was told to stop taking my Omeprazole 20mg. So in place I have been taking Zantac 150mg 2x a day as well as Tums chewable, maximum dose and they only just put a dent into taking care of it. I am absolutely miserable. I have lost weight the past month and I want to cry because my stomach hurts sometimes from no food, but I can hardly eat because of it being stuck in my throat all the time. The nausea is not so bad to deal with, it's the acid reflux. My OB said I could go back on it if I wanted to since there isn't any harmful evidence, just at a lower dose, like 10mg. I'm nervous because I know it is a category C, and there is not enough studies to be conclusive if it is harmful or not.

Has anyone here taken omeprazole during pregnancy? And did everything turn out ok?