Are you confusing "chest pain" with heart burn? Are you taking a daily PPI? During the first two weeks I had to get my surgeons Ok to take my prilosec twice a day. And adjusting the time made a the relief for my heart burn / chest pain. My first week at home I was slow with liquids- normal. But I did have to play around with water, add flavor, change temperatures (one day Rooney temp, next ice cold, next with ice) one I got the flavors and temp right it was much easier. I also lived on bone broth my first two weeks to get my protein because it hurt to drink protein shakes. The first 2-3 weeks your belly is definitely healing and needs time to adjust, don't forget you had a breathing tube during surgery and that also creates some irritation with fluids. Just take your time and try to stay hydrated followed by your protein.