I have GERD, acid reflux, and heartburn and GP, but my a1c's were never above 8. However, I have an irritable gut to begin with, so I think the BG situation only aggravated that.
I used to be ok taking Tagamet, then Zantac, then Prilosec, and finally Previcid before my acid reflux went away.
I think it's all tied up in the endocrine system.
However, I didn't notice the difference in my BG when those symptoms were going on - I was too busy either gagging or rubbing my chest from heartburn.
Now that I'm under more strict control, I notice a lot less symptoms with my GERD and GP, even though I'm on Byetta, which slows down the digestion.
Good luck, Jill!