C.R.
My son, 6, had his tonsils out on Tuesday (3 days ago). After surgery we were in recovery for less than 2 hours before being released to go home. About an hour after getting home I asked if he wanted a popsicle or yogurt, he said no that he wanted a PB&J sandwich. I made it and he ate it with no issues. Our ENT said he can eat what he wants except for chips and popcorn. We are keeping on top of the pain meds, setting reminders on our phones when it is time for the next dose. The mornings just after waking up have been the worst just because his throat is dry and the meds have worn off. We aren't waking him for med. We are using a humidifier in his room to help with dryness.
My opinion is that she will freak out more if you freak out. So, you need to relax a bit. Kids go through this all the time with no complications. Our ENT prescribed anti-nausea meds just in case, we haven't used them. Our pain med is the tylenol/codene combo.
Her being scared is ok and expected, you being scared isn't good for her. Keep lots of cold things to eat and drink, keep her drinking often, stay on the meds. She will calm down when she sees that you aren't very worried.
ADD: I wanted to add that the morning of surgery, my tummy was in knots but I put on my game face. My son played on his DS while being prepped for surgery and they let him take it to surgery with him which was a great distraction.