Whenever I Eat Sweet Foods, My Throat Seems To Burn

Whenever I eat sweet foods, my throat seems to burn and so I need to drink water. Also, the past few years (I'm 17) I've been having tonsil stones just occasionally. And lately I've been having heartburn and canker sores in my mouth, which I'm not sure if that's just for other reasons. And I also noticed I have these little ridges in my fingernails by the cuticle in little lines. Its odd, and I just recently got it. I'm just wondering what may be the cause of some of these things.