3 days post op, always feel full, bad reflux

I’ve been doing good with meeting my hydration goal, but I feel super full even if I’ve only had water. I know I have to put something in my stomach so I usually drink a protein shake or chicken broth over the course of an hour or so. I’m also having bad reflux at random times and I’ve been taking tums every 3-4 hours. Is this normal for the early stages of recovery?