Hi, I had my tonsils out at 24yrs, am now almost 34yrs. It didn't change my voice at all and to control alot of the pain I had the dissolvable panadeine (paracetamol & codiene), by the packet instructions. You shouldn't have to be away from school very long if you take painkillers. Be careful what you eat, I drank alot of sustagen (protein & added vitamins drinks, in different flavours), to get me through. My blood was being poisoned from having had glandular fever, then tonsilitis for a couple of yrs, (almost had tonsilitis non stop), so it was worth it for me. But I do have problems now with congestion forming in my throat, which I believe are from not having much of my tonsils left, as they left a tiny little bit in that was ok.