I had it done at age 20 and it was the best diet I ever went on

Lost 15 lbs in 11 days. Truly, the pain was really bad, I also couldn't eat things like ice cream that other people say you can. I actually didn't eat anything for the first 3 days post-op, then for the next 5 days I ate chocolate pudding. I tried other things like apple sauce but everything but chocolate pudding killed. But...it was worth it! Didn't get sick all the time and pain is temporary.
Best advice I got from my doc--time your pain meds so you know to drink as much water as you can as soon as they "kick in" and it doesn't feel quite like shards of glass in your throat. Apparently a lot of post-tonsillectomy patients end up in the ER for dehydration because it hurts to drink.