I Can't Sing Anymore?

[DominiquePerson7]

I'm in my school's girl choir and I'm varsity, I sing soprano 1 and it doesn't strain my voice when I sing. Recently before new years, I couldn't sing as high as I used to. I tested how high I can go, and I made it to F3, which in Alto (the lowest in girls choir). I'm supposed to go to UIL soon and I don't want to ruin it for everyone cause this will be their 3rd year in the row winning and I don't want to Dissapoint anyone.
I found out that I have Tonsil Stones but I just take then out and I have a sore throat but usually I can still sing. My teacher said that maybe it has to do with my tonsils, but I'm not sure. I can't even speak normally cause I have a light cheery voice but now it cuts off when I try to raise my voice.
I just turned 15 and I don't know but, is this apart of puberty?

[Sqad]

" is this apart of puberty?"

Yes...........nothing to do with your your "tonsil stones."