Absolutely normal. You may also have some bouts of pain in your left shoulder from gas trapped under your diaphragm, nausea, a really sore throat (from the tube they put down your throat) and exceedingly wobbly knees. Also totally normal.
This will most likely be pretty much over by day 3, so ask for pain and nausea Meds as you need them, move around as much as you can, and follow your surgeon's refeeding plan exactly - you're on the loser's bench now! Congratulations!
Oh, you'll be learning to take tiny, tiny sips, and need to be doing so pretty much constantly for the next while. A straw helps a lot for me, some plans don't allow them. Try different temperatures to see what works best for you. My TinyTum likes hot or cold but not room temperature, loves filtered water, very dilute fruit juice, broth and herb tea, hates apple juice and is totally miserable if I send down tap water or anything containing Splenda or aspartame. (whi*****ludes every protein shake out there and Crystal Light)
Greek yogurt is going to be your new best friend - Costco's Kirkland is the best price in town. (3 for $7.89)
Welcome to "the Other Side."