Your only 2 days post-op, how long were you in the hospital? I'm pre op and what I gather from here is make sure you take SLOW and TINY sips, check if you like your liquids cold/hot/room temp? Also are you on any heartburn meds? Like Prilosec, Nexium? And remember your stomach is soo raw right now, it will get better
And don't forget to call your surgeon and don't feel like your being a bother! I hope you get better