I fasted until 12am the night before and my op was done the next afternoon.
Day 5-9 is the worst so I am told and I think I can confirm this because I am on day 6 and it is painful. However it's only painful if I let my meds wear off. If you stay nicely dosed up with the meds you should be fine
Tonsillectomy is a pain but it's not as bad as they say it is so long as you STAY
on the meds.
Best of luck and keep us all informed of your progress