I have that same problem. I also had a hiatal hernia repaired. I wake up everyday nauseous some days as the day goes on it gets better most days it doesn't. I haven't thrown up at all since surgery July 9th but sometimes try thinking it will help but nothing comes out. I spoke with my doctor about it and they said it is normal to feel like that for the first 3 months out of surgery. Wish I had more advice for you, I have just been counting down until the 3 months are up.